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-solutions/README.md
\ No newline at end of file
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+# Go Solution for Leetcode algorithm problems
+
+[![Build Status](https://travis-ci.org/zwfang/leetcode.svg?branch=master)](https://travis-ci.org/zwfang/leetcode)
+[![codecov](https://codecov.io/gh/zwfang/leetcode/branch/master/graph/badge.svg)](https://codecov.io/gh/zwfang/leetcode)
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/86cf2613fa544ab5b254e2a7e5d9deb8)](https://www.codacy.com/app/zwfang/leetcode?utm_source=github.com&utm_medium=referral&utm_content=zwfang/leetcode&utm_campaign=Badge_Grade)
+[![Go Report Card](https://goreportcard.com/badge/github.com/zwfang/leetcode)](https://goreportcard.com/report/github.com/zwfang/leetcode)
+
+continually updating 😃.
+
+### [view by sorted](./src/README.md)
+
+### Array
+* [1. Two Sum](src/0001_two_sum/twosum.go)   *`lookup table;`*  *`hash table`*
+* [4. Median of Two Sorted Arrays](src/0004_median_of_two_sorted_arrays/motsa.go)   *`binary search;`*  *`divide and conquer`*
+* [11. Container With Most Water](src/0011_container_with_most_water/container_with_most_water.go)   *`double index;`*  *`array`*
+* [15. 3Sum](src/0015_3Sum/3sum.go)   *`double index;`*  *`array`*
+* [26. Remove Duplicates from Sorted Array](src/0026_remove_duplicates_from_sorted_array/rdfsa.go)   *`double index;`*  *`array`*
+* [27. Remove Element](src/0027_remove_element/remove_element.go)   *`double index;`*  *`array`*
+* [48. Rotate Image](src/0048_rotate_image/rotate_image.go)
+* [53. Maximum Subarray](src/0053_maximum_subarray/maximum_subarray.go)   *`dynamic programming`*
+* [75. Sort Colors](src/0075_sort_colors/sort_colors.go)   *`sort;`*  *`array`*
+* [80. Remove Duplicates from Sorted Array II](src/0080_remove_duplicates_from_sorted_array2/rdfsa2.go)   *`double index;`*  *`array`*
+* [88. Merge Sorted Array](src/0088_merge_sorted_array/msa.go)   *`sort;`*  *`array`*
+* [121. Best Time to Buy and Sell Stock](src/0121_best_time_to_buy_and_sell_stock/maxprofit.go)   *`dynamic programming;`*  *`array`*
+* [122. Best Time to Buy and Sell Stock II](src/0122_best_time_to_buy_and_sell_stock_2/maxprofit.go)   *`greedy;`*  *`array`*
+* [136. Single Number](src/0136_single_number/single_number.go)   *`hash table;`*  *`bit manipulation`*
+* [167. Two Sum II - Input array is sorted](src/0167_two_sum2/two_sum2.go)   *`double index;`*  *`binary search`*
+* [179. Largest Number](src/0179_largest_number/ln.go)   *`sort`*
+* [200. Number of Islands](src/0200_number_of_island/number_of_island.go)   *`dfs;`*  *`bfs`*
+* [209. Minimum Size Subarray Sum](src/0209_minimum_size_subarray_sum/minimum_size_subarray_sum.go)   *`sliding window`*
+* [215. Kth Largest Element in an Array](src/0215_kth_largest_element_in_an_array/kthleiaa.go)   *`sort`*
+* [217. Contains Duplicate](src/0217_contains_duplicate/contains_duplicate.go)   *`map`*
+* [219. Contains Duplicate II](src/0219_contains_duplicate_2/contains_duplicate_2.go)   *`map`*
+* [283. Move Zeroes(solution1)](src/0283_move_zeroes/move_zeroes.go)   *`sliding window`*
+* [283. Move Zeroes(solution2)](src/0283_move_zeroes/move_zeroes2.go)   *`sliding window`*
+* [303. Range Sum Query - Immutable](src/0303_range_sum_query/rsqim.go)
+* [347. Top K Frequent Elements](src/0347_top_k_frequent_elements/topkfe.go)   *`hash table;`*  *`heap`*
+* [349. Intersection of Two Arrays](src/0349_intersection_of_2_arrays/intersection_of_two_arrays.go)   *`set`*
+* [350. Intersection of Two Arrays II](src/0350_intersection_of_two_arrays2/intersection_of_two_arrays2.go)   *`hash table`*
+* [447. Number of Boomerangs](src/0447_number_of_boomerangs/number_of_boomerangs.go)   *`hash table`*
+* [454. 4Sum II](src/0454_4sum2/4sum2.go)   *`hash table`*
+* [674. Longest Continuous Increasing Subsequence](src/0674_longest_continuous_increasing_subsequence/lcis.go)
+* [713. Subarray Product Less Than K](src/0713_subarray_product_less_than_k/spltk.go)   *`sliding window`*  *`array`*
+* [717. 1-bit and 2-bit Characters](src/0717_1_bit_and_2_bit_characters/1bitand2bitc.go)
+* [747. Largest Number At Least Twice of Others](src/0747_largest_number_at_least_twice_of_others/largest_number_at_least_twice_of_others.go)
+
+### Stack
+* [155. Min Stack](src/0155_min_stack/min_stack.go)
+* [735. Asteroid Collision](src/0735_asteroid_collision/ac.go)
+
+### String
+* [3. Longest Substring Without Repeating Characters](src/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters.go)   *`sliding window;`*  *`hash table`*
+* [14. Longest Common Prefix](src/0014_longest_common_prefix/lcp.go)
+* [17. Letter Combinations of a Phone Number](src/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number.go)   *`tree`*
+* [20. Valid Parentheses](src/0020_valid_parentheses/valid_parentheses.go)   *`stack`*
+* [28. Implement strStr()](src/0028_implement_strstr/implement_strstr.go)   *`double index`*
+* [58. Length of Last Word](src/0058_length_of_last_word/len_of_last_word.go)
+* [67. Add Binary](src/0067_add_binary/add_binary.go)   *`brute force`*
+* [76. Minimum Window Substring](src/0076_minimum_window_substring/minimum_window_substring.go)    *`sliding window`*
+* [125. Valid Palindrome](src/0125_valid_palindrome/valid_palindrome.go)   *`string;`*  *`double index`*
+* [165. Compare Version Numbers](src/0165_compare_version_numbers/compare_version_numbers.go)
+* [344. Reverse String](src/0344_reverse_string/reverse_string.go)   *`string;`*  *`double index`*
+* [345. Reverse Vowels of a String](src/0345_reverse_vowels_of_a_string/reverse_vowels.go)   *`string;`*  *`double index`*
+* [438. Find All Anagrams in a String](src/0438_all_anagrams_in_a_string/all_anagrams_in_a_string.go)   *`sliding window`*
+* [557. Reverse Words in a String III](src/0557_reverse_words_in_a_string_3/reverse_words_in_a_string_3.go)
+* [1021. Remove Outermost Parentheses](src/1021_Remove_Outermost_Parentheses/remove_outmost_parentheses.go)   *`stack`*
+
+### Linked List
+* [2. Add Two Numbers](src/0002_add_two_numbers/add_two_numbers.go)   *`recursion;`*  *`math`*
+* [19. Remove Nth Node From End of List](src/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list.go)   *`two pointers`*
+* [21. Merge Two Sorted Lists](src/0021_merge_two_sorted_lists/mergeTwoLists.go)
+* [23. Merge k Sorted Lists](src/0023_merge_k_sorted_lists/mksl.go)   *`heap`*
+* [24. Swap Nodes in Pairs](src/0024_swap_nodes_in_pairs/swap_nodes_in_pairs.go)
+* [25. Reverse Nodes in k-Group](src/0025_reverse_nodes_in_k_group/reverse_node_k_group.go)
+* [61. Rotate List](src/0061_rotate_list/rotate_list.go)
+* [82. Remove Duplicates from Sorted List II](src/0082_remove_duplicates_from_sorted_list_2/rdfsl.go)
+* [83. Remove Duplicates from Sorted List](src/0083_remove_duplicates_from_sorted_list/rdfsl.go)
+* [86. Partition List](src/0086_partition_list/partition_list.go)   *`two pointers`*
+* [92. Reverse Linked List II](src/0092_reverse_linked_list_2/reverse_linked_list2.go)
+* [148. Sort List](src/148_Sort_List/sortlist.go)   *`sort`*
+* [203. Remove Linked List Elements](src/0203_remove_linked_list_elements/remove_linked_list_elements.go)
+* [206. Reverse Linked List](src/0206_reverse_linked_list/reverse_linked_list.go)
+* [237. Delete Node in a Linked List](src/0237_delete_node_in_a_linked_list/dniall.go)
+* [328. Odd Even Linked List](src/0328_odd_even_linked_list/odd_even_linked_list.go)
+
+### Dynamic Programming
+* [62. Unique Paths](src/0062_unique_paths/unique_paths.go)   *`array`*
+* [63. Unique Paths 2](src/0063_unique_paths_2/unique_paths2.go)   *`array`*
+* [64. Minimum Path Sum](src/0064_minimum_path_sum/minimum_path_sum.go)   *`array`*
+* [70. Climbing Stairs](src/0070_climbing_stairs/climbing_stairs.go)
+* [120. Triangle](src/0120_triangle/triangle.go)   *`array`*
+* [198. House Robber](src/0198_house_robber/house_robber.go)
+* [300. Longest Increasing Subsequence](src/0300_longest_increasing_subsequence/lis.go)
+* [304. Range Sum Query 2D - Immutable](src/304_Range_Sum_Query_2D/rsq.go)
+* [343. Integer Break](src/0343_integer_break/integer_break.go)   *`math`*
+* [376. Wiggle Subsequence](src/0376_wiggle_subsequence/wiggle_subsequence.go)   *`greedy;`*  *`dynamic programming`*
+* [416. Partition Equal Subset Sum](src/0416_partition_equal_subset_sum/partition_equal_subset_sum.go)  *`0-1 knapsack problem`*
+* [435. Non-overlapping Intervals](src/0435_non_overlapping_intervals/dp_solution.go)   *`greedy;`*  *`dynamic programming`*  *`0-1 knapsack problem`*
+
+### Greedy
+* [392. Is Subsequence](src/0392_is_subsequence/is_subsequence.go)
+* [435. Non-overlapping Intervals](src/0435_non_overlapping_intervals/greedy_solution.go)   *`greedy;`*  *`dynamic programming`*
+* [455. Assign Cookies](src/0455_assign_cookies/assign_cookies.go)
+
+### Backtracking
+* [77. Combinations](src/0077_combinations/combinations.go)   *`combine`*
+* [79. Word Search](src/0079_word_search/word_search.go)   *`array`*
+
+### Tree
+* [94. Binary Tree Inorder Traversal](src/0094_binary_tree_inorder_traversal/binary_tree_inorder_traversal.go)   *`binary tree;`*   *`stack`*
+* [100. Same Tree](src/0100_same_tree/same_tree.go)   *`binary tree;`*   *`dfs`*
+* [101. Symmetric Tree](src/0101_symmetric_tree/symmetric_tree.go)   *`binary tree;`*   *`dfs;`*  *`bfs;`*
+* [102. Binary Tree Level Order Traversal](src/0102_binary_tree_level_order_traversal/binary_tree_level_order_traversal.go)   *`binary tree;`*   *`dfs`*
+* [104. Maximum Depth of Binary Tree](src/0104_maximun_depth_of_binary_tree/maxdobt.go)   *`binary tree depth`*
+* [107. Binary Tree Level Order Traversal II](src/0107_binary_tree_level_order_traversal_2/binary_tree_level_order_traversal2.go)   *`binary tree;`*   *`bfs`*
+* [111. Minimum Depth of Binary Tree](src/0111_minimum_depth_of_binary_tree/minimum_depth_of_binary_tree.go)   *`binary tree;`*   *`dfs`*
+* [112. Path Sum](src/0112_path_sum/path_sum.go)   *`binary tree;`*   *`dfs`*
+* [144. Binary Tree Preorder Traversal](src/0144_binary_tree_preorder_traversal/binary_tree_preorder_traversal.go)   *`binary tree;`*   *`pre-order traversal`*
+* [208. Implement Trie (Prefix Tree)](src/0208_implement_trie_prefix_tree/impltrie.go)   *`trie`*
+* [226. Invert Binary Tree](src/0226_invert_binary_tree/invert_binary_tree.go)   *`binary tree`*
+* [211. Add and Search Word - Data structure design](src/0211_add_and_search_word/add_and_search_word.go)   *`trie`*
+* [235. Lowest Common Ancestor of a Binary Search Tree](src/0235_lowest_common_ancestor_of_a_binary_search_tree/lcaoabst.go)   *`binary tree`*
+* [236. Lowest Common Ancestor of a Binary Tree](src/0236_Lowest_Common_Ancestor_of_a_Binary_Tree/lca.go)   *`binary tree`*
+* [257. Binary Tree Paths](src/0257_binary_tree_paths/binary_tree_paths.go)   *`binary tree`*
+* [307. Range Sum Query - Mutable](src/0307_Range_Sum_Query_Mutable/range_sum_query_mut.go)   *`segment tree`*
+* [404. Sum of Left Leaves](src/0404_sum_of_left_leaves/sum_of_left_leaves.go)   *`binary tree`*
+* [437. Path Sum III](src/0437_path_sum_3/path_sum_3.go)   *`binary tree`*
+* [677. Map Sum Pairs](src/0677_map_sum_pairs/map_sum_pairs.go)   *`trie`*
+* [872. Leaf-Similar Trees](src/0872_leaf_similar_trees/leaf_similar_trees.go)   *`binary tree`*
+
+### Binary Search
+* [33. Search in Rotated Sorted Array](src/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array.go)   *`array;`*  *`binary search`*
+* [34. Find First and Last Position of Element in Sorted Array](src/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array.go)   *`array;`*  *`binary search`*
+* [35. Search Insert Position](src/0035_search_insert_position/search_insert_position.go)   *`array;`*  *`binary search`*
+* [69. Sqrt(x)](src/0069_sqrtx/sqrtx.go)   *`math;`*  *`binary search`*
+* [153. Find Minimum in Rotated Sorted Array](src/0153_find_minimum_in_rotated_sorted_array/fmirsa.go)
+* [704. Binary Search](src/0704_binary_search/binary_search.go)
+
+### Math
+* [7. Reverse Integer](src/0007_reverse_integer/reverse_integer.go)
+* [9. Palindrome Number](src/0009_palindrome_number/palindrome_number.go)
+* [13. Roman to Integer](src/0013_roman_to_integer/roman_to_integer.go)   *`string`*
+* [66. Plus One](src/0066_plus_one/plus_one.go)   *`array`*
+* [150. Evaluate Reverse Polish Notation](src/0150_evaluate_reverse_polish_notation/evaluate_reverse_polish_notation.go)   *`stack`*
+* [258. Add Digits](src/0258_add_digits/add_digits.go)
diff --git a/bak.README.md b/bak.README.md
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-# Go Solution for Leetcode algorithm problems
-
-[![Build Status](https://travis-ci.org/zwfang/leetcode.svg?branch=master)](https://travis-ci.org/zwfang/leetcode)
-[![codecov](https://codecov.io/gh/zwfang/leetcode/branch/master/graph/badge.svg)](https://codecov.io/gh/zwfang/leetcode)
-[![Codacy Badge](https://api.codacy.com/project/badge/Grade/86cf2613fa544ab5b254e2a7e5d9deb8)](https://www.codacy.com/app/zwfang/leetcode?utm_source=github.com&utm_medium=referral&utm_content=zwfang/leetcode&utm_campaign=Badge_Grade)
-[![Go Report Card](https://goreportcard.com/badge/github.com/zwfang/leetcode)](https://goreportcard.com/report/github.com/zwfang/leetcode)
-
-continually updating 😃.
-
-### [view by sorted](./solutions/README.md)
-
-### Array
-* [1. Two Sum](solutions/0001_two_sum/twosum.go)   *`lookup table;`*  *`hash table`*
-* [4. Median of Two Sorted Arrays](solutions/0004_median_of_two_sorted_arrays/motsa.go)   *`binary search;`*  *`divide and conquer`*
-* [11. Container With Most Water](solutions/0011_container_with_most_water/container_with_most_water.go)   *`double index;`*  *`array`*
-* [15. 3Sum](solutions/0015_3Sum/3sum.go)   *`double index;`*  *`array`*
-* [26. Remove Duplicates from Sorted Array](solutions/0026_remove_duplicates_from_sorted_array/rdfsa.go)   *`double index;`*  *`array`*
-* [27. Remove Element](solutions/0027_remove_element/remove_element.go)   *`double index;`*  *`array`*
-* [48. Rotate Image](solutions/0048_rotate_image/rotate_image.go)
-* [53. Maximum Subarray](solutions/0053_maximum_subarray/maximum_subarray.go)   *`dynamic programming`*
-* [75. Sort Colors](solutions/0075_sort_colors/sort_colors.go)   *`sort;`*  *`array`*
-* [80. Remove Duplicates from Sorted Array II](solutions/0080_remove_duplicates_from_sorted_array2/rdfsa2.go)   *`double index;`*  *`array`*
-* [88. Merge Sorted Array](solutions/0088_merge_sorted_array/msa.go)   *`sort;`*  *`array`*
-* [121. Best Time to Buy and Sell Stock](solutions/0121_best_time_to_buy_and_sell_stock/maxprofit.go)   *`dynamic programming;`*  *`array`*
-* [122. Best Time to Buy and Sell Stock II](solutions/0122_best_time_to_buy_and_sell_stock_2/maxprofit.go)   *`greedy;`*  *`array`*
-* [136. Single Number](solutions/0136_single_number/single_number.go)   *`hash table;`*  *`bit manipulation`*
-* [167. Two Sum II - Input array is sorted](solutions/0167_two_sum2/two_sum2.go)   *`double index;`*  *`binary search`*
-* [179. Largest Number](solutions/0179_largest_number/ln.go)   *`sort`*
-* [200. Number of Islands](solutions/0200_number_of_island/number_of_island.go)   *`dfs;`*  *`bfs`*
-* [209. Minimum Size Subarray Sum](solutions/0209_minimum_size_subarray_sum/minimum_size_subarray_sum.go)   *`sliding window`*
-* [215. Kth Largest Element in an Array](solutions/0215_kth_largest_element_in_an_array/kthleiaa.go)   *`sort`*
-* [217. Contains Duplicate](solutions/0217_contains_duplicate/contains_duplicate.go)   *`map`*
-* [219. Contains Duplicate II](solutions/0219_contains_duplicate_2/contains_duplicate_2.go)   *`map`*
-* [283. Move Zeroes(solution1)](solutions/0283_move_zeroes/move_zeroes.go)   *`sliding window`*
-* [283. Move Zeroes(solution2)](solutions/0283_move_zeroes/move_zeroes2.go)   *`sliding window`*
-* [303. Range Sum Query - Immutable](solutions/0303_range_sum_query/rsqim.go)
-* [347. Top K Frequent Elements](solutions/0347_top_k_frequent_elements/topkfe.go)   *`hash table;`*  *`heap`*
-* [349. Intersection of Two Arrays](solutions/0349_intersection_of_2_arrays/intersection_of_two_arrays.go)   *`set`*
-* [350. Intersection of Two Arrays II](solutions/0350_intersection_of_two_arrays2/intersection_of_two_arrays2.go)   *`hash table`*
-* [447. Number of Boomerangs](solutions/0447_number_of_boomerangs/number_of_boomerangs.go)   *`hash table`*
-* [454. 4Sum II](solutions/0454_4sum2/4sum2.go)   *`hash table`*
-* [674. Longest Continuous Increasing Subsequence](solutions/0674_longest_continuous_increasing_subsequence/lcis.go)
-* [713. Subarray Product Less Than K](solutions/0713_subarray_product_less_than_k/spltk.go)   *`sliding window`*  *`array`*
-* [717. 1-bit and 2-bit Characters](solutions/0717_1_bit_and_2_bit_characters/1bitand2bitc.go)
-* [747. Largest Number At Least Twice of Others](solutions/0747_largest_number_at_least_twice_of_others/largest_number_at_least_twice_of_others.go)
-
-### Stack
-* [155. Min Stack](solutions/0155_min_stack/min_stack.go)
-* [735. Asteroid Collision](solutions/0735_asteroid_collision/ac.go)
-
-### String
-* [3. Longest Substring Without Repeating Characters](solutions/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters.go)   *`sliding window;`*  *`hash table`*
-* [14. Longest Common Prefix](solutions/0014_longest_common_prefix/lcp.go)
-* [17. Letter Combinations of a Phone Number](solutions/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number.go)   *`tree`*
-* [20. Valid Parentheses](solutions/0020_valid_parentheses/valid_parentheses.go)   *`stack`*
-* [28. Implement strStr()](solutions/0028_implement_strstr/implement_strstr.go)   *`double index`*
-* [58. Length of Last Word](solutions/0058_length_of_last_word/len_of_last_word.go)
-* [67. Add Binary](solutions/0067_add_binary/add_binary.go)   *`brute force`*
-* [76. Minimum Window Substring](solutions/0076_minimum_window_substring/minimum_window_substring.go)    *`sliding window`*
-* [125. Valid Palindrome](solutions/0125_valid_palindrome/valid_palindrome.go)   *`string;`*  *`double index`*
-* [165. Compare Version Numbers](solutions/0165_compare_version_numbers/compare_version_numbers.go)
-* [344. Reverse String](solutions/0344_reverse_string/reverse_string.go)   *`string;`*  *`double index`*
-* [345. Reverse Vowels of a String](solutions/0345_reverse_vowels_of_a_string/reverse_vowels.go)   *`string;`*  *`double index`*
-* [438. Find All Anagrams in a String](solutions/0438_all_anagrams_in_a_string/all_anagrams_in_a_string.go)   *`sliding window`*
-* [557. Reverse Words in a String III](solutions/0557_reverse_words_in_a_string_3/reverse_words_in_a_string_3.go)
-* [1021. Remove Outermost Parentheses](solutions/1021_Remove_Outermost_Parentheses/remove_outmost_parentheses.go)   *`stack`*
-
-### Linked List
-* [2. Add Two Numbers](solutions/0002_add_two_numbers/add_two_numbers.go)   *`recursion;`*  *`math`*
-* [19. Remove Nth Node From End of List](solutions/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list.go)   *`two pointers`*
-* [21. Merge Two Sorted Lists](solutions/0021_merge_two_sorted_lists/mergeTwoLists.go)
-* [23. Merge k Sorted Lists](solutions/0023_merge_k_sorted_lists/mksl.go)   *`heap`*
-* [24. Swap Nodes in Pairs](solutions/0024_swap_nodes_in_pairs/swap_nodes_in_pairs.go)
-* [25. Reverse Nodes in k-Group](solutions/0025_reverse_nodes_in_k_group/reverse_node_k_group.go)
-* [61. Rotate List](solutions/0061_rotate_list/rotate_list.go)
-* [82. Remove Duplicates from Sorted List II](solutions/0082_remove_duplicates_from_sorted_list_2/rdfsl.go)
-* [83. Remove Duplicates from Sorted List](solutions/0083_remove_duplicates_from_sorted_list/rdfsl.go)
-* [86. Partition List](solutions/0086_partition_list/partition_list.go)   *`two pointers`*
-* [92. Reverse Linked List II](solutions/0092_reverse_linked_list_2/reverse_linked_list2.go)
-* [148. Sort List](solutions/148_Sort_List/sortlist.go)   *`sort`*
-* [203. Remove Linked List Elements](solutions/0203_remove_linked_list_elements/remove_linked_list_elements.go)
-* [206. Reverse Linked List](solutions/0206_reverse_linked_list/reverse_linked_list.go)
-* [237. Delete Node in a Linked List](solutions/0237_delete_node_in_a_linked_list/dniall.go)
-* [328. Odd Even Linked List](solutions/0328_odd_even_linked_list/odd_even_linked_list.go)
-
-### Dynamic Programming
-* [62. Unique Paths](solutions/0062_unique_paths/unique_paths.go)   *`array`*
-* [63. Unique Paths 2](solutions/0063_unique_paths_2/unique_paths2.go)   *`array`*
-* [64. Minimum Path Sum](solutions/0064_minimum_path_sum/minimum_path_sum.go)   *`array`*
-* [70. Climbing Stairs](solutions/0070_climbing_stairs/climbing_stairs.go)
-* [120. Triangle](solutions/0120_triangle/triangle.go)   *`array`*
-* [198. House Robber](solutions/0198_house_robber/house_robber.go)
-* [300. Longest Increasing Subsequence](solutions/0300_longest_increasing_subsequence/lis.go)
-* [304. Range Sum Query 2D - Immutable](solutions/304_Range_Sum_Query_2D/rsq.go)
-* [343. Integer Break](solutions/0343_integer_break/integer_break.go)   *`math`*
-* [376. Wiggle Subsequence](solutions/0376_wiggle_subsequence/wiggle_subsequence.go)   *`greedy;`*  *`dynamic programming`*
-* [416. Partition Equal Subset Sum](solutions/0416_partition_equal_subset_sum/partition_equal_subset_sum.go)  *`0-1 knapsack problem`*
-* [435. Non-overlapping Intervals](solutions/0435_non_overlapping_intervals/dp_solution.go)   *`greedy;`*  *`dynamic programming`*  *`0-1 knapsack problem`*
-
-### Greedy
-* [392. Is Subsequence](solutions/0392_is_subsequence/is_subsequence.go)
-* [435. Non-overlapping Intervals](solutions/0435_non_overlapping_intervals/greedy_solution.go)   *`greedy;`*  *`dynamic programming`*
-* [455. Assign Cookies](solutions/0455_assign_cookies/assign_cookies.go)
-
-### Backtracking
-* [77. Combinations](solutions/0077_combinations/combinations.go)   *`combine`*
-* [79. Word Search](solutions/0079_word_search/word_search.go)   *`array`*
-
-### Tree
-* [94. Binary Tree Inorder Traversal](solutions/0094_binary_tree_inorder_traversal/binary_tree_inorder_traversal.go)   *`binary tree;`*   *`stack`*
-* [100. Same Tree](solutions/0100_same_tree/same_tree.go)   *`binary tree;`*   *`dfs`*
-* [101. Symmetric Tree](solutions/0101_symmetric_tree/symmetric_tree.go)   *`binary tree;`*   *`dfs;`*  *`bfs;`*
-* [102. Binary Tree Level Order Traversal](solutions/0102_binary_tree_level_order_traversal/binary_tree_level_order_traversal.go)   *`binary tree;`*   *`dfs`*
-* [104. Maximum Depth of Binary Tree](solutions/0104_maximun_depth_of_binary_tree/maxdobt.go)   *`binary tree depth`*
-* [107. Binary Tree Level Order Traversal II](solutions/0107_binary_tree_level_order_traversal_2/binary_tree_level_order_traversal2.go)   *`binary tree;`*   *`bfs`*
-* [111. Minimum Depth of Binary Tree](solutions/0111_minimum_depth_of_binary_tree/minimum_depth_of_binary_tree.go)   *`binary tree;`*   *`dfs`*
-* [112. Path Sum](solutions/0112_path_sum/path_sum.go)   *`binary tree;`*   *`dfs`*
-* [144. Binary Tree Preorder Traversal](solutions/0144_binary_tree_preorder_traversal/binary_tree_preorder_traversal.go)   *`binary tree;`*   *`pre-order traversal`*
-* [208. Implement Trie (Prefix Tree)](solutions/0208_implement_trie_prefix_tree/impltrie.go)   *`trie`*
-* [226. Invert Binary Tree](solutions/0226_invert_binary_tree/invert_binary_tree.go)   *`binary tree`*
-* [211. Add and Search Word - Data structure design](solutions/0211_add_and_search_word/add_and_search_word.go)   *`trie`*
-* [235. Lowest Common Ancestor of a Binary Search Tree](solutions/0235_lowest_common_ancestor_of_a_binary_search_tree/lcaoabst.go)   *`binary tree`*
-* [236. Lowest Common Ancestor of a Binary Tree](solutions/0236_Lowest_Common_Ancestor_of_a_Binary_Tree/lca.go)   *`binary tree`*
-* [257. Binary Tree Paths](solutions/0257_binary_tree_paths/binary_tree_paths.go)   *`binary tree`*
-* [307. Range Sum Query - Mutable](solutions/0307_Range_Sum_Query_Mutable/range_sum_query_mut.go)   *`segment tree`*
-* [404. Sum of Left Leaves](solutions/0404_sum_of_left_leaves/sum_of_left_leaves.go)   *`binary tree`*
-* [437. Path Sum III](solutions/0437_path_sum_3/path_sum_3.go)   *`binary tree`*
-* [677. Map Sum Pairs](solutions/0677_map_sum_pairs/map_sum_pairs.go)   *`trie`*
-* [872. Leaf-Similar Trees](solutions/0872_leaf_similar_trees/leaf_similar_trees.go)   *`binary tree`*
-
-### Binary Search
-* [33. Search in Rotated Sorted Array](solutions/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array.go)   *`array;`*  *`binary search`*
-* [34. Find First and Last Position of Element in Sorted Array](solutions/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array.go)   *`array;`*  *`binary search`*
-* [35. Search Insert Position](solutions/0035_search_insert_position/search_insert_position.go)   *`array;`*  *`binary search`*
-* [69. Sqrt(x)](solutions/0069_sqrtx/sqrtx.go)   *`math;`*  *`binary search`*
-* [153. Find Minimum in Rotated Sorted Array](solutions/0153_find_minimum_in_rotated_sorted_array/fmirsa.go)
-* [704. Binary Search](solutions/0704_binary_search/binary_search.go)
-
-### Math
-* [7. Reverse Integer](solutions/0007_reverse_integer/reverse_integer.go)
-* [9. Palindrome Number](solutions/0009_palindrome_number/palindrome_number.go)
-* [13. Roman to Integer](solutions/0013_roman_to_integer/roman_to_integer.go)   *`string`*
-* [66. Plus One](solutions/0066_plus_one/plus_one.go)   *`array`*
-* [150. Evaluate Reverse Polish Notation](solutions/0150_evaluate_reverse_polish_notation/evaluate_reverse_polish_notation.go)   *`stack`*
-* [258. Add Digits](solutions/0258_add_digits/add_digits.go)
diff --git a/solutions/0001_two_sum/twosum.go b/src/0001_two_sum/twosum.go
similarity index 100%
rename from solutions/0001_two_sum/twosum.go
rename to src/0001_two_sum/twosum.go
diff --git a/solutions/0001_two_sum/twosum_test.go b/src/0001_two_sum/twosum_test.go
similarity index 100%
rename from solutions/0001_two_sum/twosum_test.go
rename to src/0001_two_sum/twosum_test.go
diff --git a/solutions/0002_add_two_numbers/add_two_numbers.go b/src/0002_add_two_numbers/add_two_numbers.go
similarity index 100%
rename from solutions/0002_add_two_numbers/add_two_numbers.go
rename to src/0002_add_two_numbers/add_two_numbers.go
diff --git a/solutions/0002_add_two_numbers/add_two_numbers_test.go b/src/0002_add_two_numbers/add_two_numbers_test.go
similarity index 100%
rename from solutions/0002_add_two_numbers/add_two_numbers_test.go
rename to src/0002_add_two_numbers/add_two_numbers_test.go
diff --git a/solutions/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters.go b/src/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters.go
similarity index 100%
rename from solutions/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters.go
rename to src/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters.go
diff --git a/solutions/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters_test.go b/src/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters_test.go
similarity index 100%
rename from solutions/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters_test.go
rename to src/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters_test.go
diff --git a/solutions/0004_median_of_two_sorted_arrays/motsa.go b/src/0004_median_of_two_sorted_arrays/motsa.go
similarity index 100%
rename from solutions/0004_median_of_two_sorted_arrays/motsa.go
rename to src/0004_median_of_two_sorted_arrays/motsa.go
diff --git a/solutions/0004_median_of_two_sorted_arrays/motsa_test.go b/src/0004_median_of_two_sorted_arrays/motsa_test.go
similarity index 100%
rename from solutions/0004_median_of_two_sorted_arrays/motsa_test.go
rename to src/0004_median_of_two_sorted_arrays/motsa_test.go
diff --git a/solutions/0007_reverse_integer/reverse_integer.go b/src/0007_reverse_integer/reverse_integer.go
similarity index 100%
rename from solutions/0007_reverse_integer/reverse_integer.go
rename to src/0007_reverse_integer/reverse_integer.go
diff --git a/solutions/0007_reverse_integer/reverse_integer_test.go b/src/0007_reverse_integer/reverse_integer_test.go
similarity index 100%
rename from solutions/0007_reverse_integer/reverse_integer_test.go
rename to src/0007_reverse_integer/reverse_integer_test.go
diff --git a/solutions/0009_palindrome_number/palindrome_number.go b/src/0009_palindrome_number/palindrome_number.go
similarity index 100%
rename from solutions/0009_palindrome_number/palindrome_number.go
rename to src/0009_palindrome_number/palindrome_number.go
diff --git a/solutions/0009_palindrome_number/palindrome_number_test.go b/src/0009_palindrome_number/palindrome_number_test.go
similarity index 100%
rename from solutions/0009_palindrome_number/palindrome_number_test.go
rename to src/0009_palindrome_number/palindrome_number_test.go
diff --git a/solutions/0011_container_with_most_water/container_with_most_water.go b/src/0011_container_with_most_water/container_with_most_water.go
similarity index 100%
rename from solutions/0011_container_with_most_water/container_with_most_water.go
rename to src/0011_container_with_most_water/container_with_most_water.go
diff --git a/solutions/0011_container_with_most_water/container_with_most_water_test.go b/src/0011_container_with_most_water/container_with_most_water_test.go
similarity index 100%
rename from solutions/0011_container_with_most_water/container_with_most_water_test.go
rename to src/0011_container_with_most_water/container_with_most_water_test.go
diff --git a/solutions/0013_roman_to_integer/roman_to_integer.go b/src/0013_roman_to_integer/roman_to_integer.go
similarity index 100%
rename from solutions/0013_roman_to_integer/roman_to_integer.go
rename to src/0013_roman_to_integer/roman_to_integer.go
diff --git a/solutions/0013_roman_to_integer/roman_to_integer_test.go b/src/0013_roman_to_integer/roman_to_integer_test.go
similarity index 100%
rename from solutions/0013_roman_to_integer/roman_to_integer_test.go
rename to src/0013_roman_to_integer/roman_to_integer_test.go
diff --git a/solutions/0014_longest_common_prefix/lcp.go b/src/0014_longest_common_prefix/lcp.go
similarity index 100%
rename from solutions/0014_longest_common_prefix/lcp.go
rename to src/0014_longest_common_prefix/lcp.go
diff --git a/solutions/0014_longest_common_prefix/lcp_test.go b/src/0014_longest_common_prefix/lcp_test.go
similarity index 100%
rename from solutions/0014_longest_common_prefix/lcp_test.go
rename to src/0014_longest_common_prefix/lcp_test.go
diff --git a/solutions/0015_3Sum/3sum.go b/src/0015_3Sum/3sum.go
similarity index 100%
rename from solutions/0015_3Sum/3sum.go
rename to src/0015_3Sum/3sum.go
diff --git a/solutions/0015_3Sum/3sum_test.go b/src/0015_3Sum/3sum_test.go
similarity index 100%
rename from solutions/0015_3Sum/3sum_test.go
rename to src/0015_3Sum/3sum_test.go
diff --git a/solutions/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number.go b/src/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number.go
similarity index 100%
rename from solutions/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number.go
rename to src/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number.go
diff --git a/solutions/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number_test.go b/src/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number_test.go
similarity index 100%
rename from solutions/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number_test.go
rename to src/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number_test.go
diff --git a/solutions/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list.go b/src/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list.go
similarity index 100%
rename from solutions/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list.go
rename to src/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list.go
diff --git a/solutions/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list_test.go b/src/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list_test.go
similarity index 100%
rename from solutions/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list_test.go
rename to src/0019_remove_nth_node_from_end_of_list/remove_nth_node_from_end_of_list_test.go
diff --git a/solutions/0020_valid_parentheses/valid_parentheses.go b/src/0020_valid_parentheses/valid_parentheses.go
similarity index 100%
rename from solutions/0020_valid_parentheses/valid_parentheses.go
rename to src/0020_valid_parentheses/valid_parentheses.go
diff --git a/solutions/0020_valid_parentheses/valid_parentheses_test.go b/src/0020_valid_parentheses/valid_parentheses_test.go
similarity index 100%
rename from solutions/0020_valid_parentheses/valid_parentheses_test.go
rename to src/0020_valid_parentheses/valid_parentheses_test.go
diff --git a/solutions/0021_merge_two_sorted_lists/mergeTwoLists.go b/src/0021_merge_two_sorted_lists/mergeTwoLists.go
similarity index 100%
rename from solutions/0021_merge_two_sorted_lists/mergeTwoLists.go
rename to src/0021_merge_two_sorted_lists/mergeTwoLists.go
diff --git a/solutions/0021_merge_two_sorted_lists/mergeTwoLists_test.go b/src/0021_merge_two_sorted_lists/mergeTwoLists_test.go
similarity index 100%
rename from solutions/0021_merge_two_sorted_lists/mergeTwoLists_test.go
rename to src/0021_merge_two_sorted_lists/mergeTwoLists_test.go
diff --git a/solutions/0023_merge_k_sorted_lists/mksl.go b/src/0023_merge_k_sorted_lists/mksl.go
similarity index 100%
rename from solutions/0023_merge_k_sorted_lists/mksl.go
rename to src/0023_merge_k_sorted_lists/mksl.go
diff --git a/solutions/0023_merge_k_sorted_lists/mksl_test.go b/src/0023_merge_k_sorted_lists/mksl_test.go
similarity index 100%
rename from solutions/0023_merge_k_sorted_lists/mksl_test.go
rename to src/0023_merge_k_sorted_lists/mksl_test.go
diff --git a/solutions/0024_swap_nodes_in_pairs/swap_nodes_in_pairs.go b/src/0024_swap_nodes_in_pairs/swap_nodes_in_pairs.go
similarity index 100%
rename from solutions/0024_swap_nodes_in_pairs/swap_nodes_in_pairs.go
rename to src/0024_swap_nodes_in_pairs/swap_nodes_in_pairs.go
diff --git a/solutions/0024_swap_nodes_in_pairs/swap_nodes_in_pairs_test.go b/src/0024_swap_nodes_in_pairs/swap_nodes_in_pairs_test.go
similarity index 100%
rename from solutions/0024_swap_nodes_in_pairs/swap_nodes_in_pairs_test.go
rename to src/0024_swap_nodes_in_pairs/swap_nodes_in_pairs_test.go
diff --git a/solutions/0025_reverse_nodes_in_k_group/reverse_node_k_group.go b/src/0025_reverse_nodes_in_k_group/reverse_node_k_group.go
similarity index 100%
rename from solutions/0025_reverse_nodes_in_k_group/reverse_node_k_group.go
rename to src/0025_reverse_nodes_in_k_group/reverse_node_k_group.go
diff --git a/solutions/0025_reverse_nodes_in_k_group/reverse_node_k_group_test.go b/src/0025_reverse_nodes_in_k_group/reverse_node_k_group_test.go
similarity index 100%
rename from solutions/0025_reverse_nodes_in_k_group/reverse_node_k_group_test.go
rename to src/0025_reverse_nodes_in_k_group/reverse_node_k_group_test.go
diff --git a/solutions/0026_remove_duplicates_from_sorted_array/rdfsa.go b/src/0026_remove_duplicates_from_sorted_array/rdfsa.go
similarity index 100%
rename from solutions/0026_remove_duplicates_from_sorted_array/rdfsa.go
rename to src/0026_remove_duplicates_from_sorted_array/rdfsa.go
diff --git a/solutions/0026_remove_duplicates_from_sorted_array/rdfsa_test.go b/src/0026_remove_duplicates_from_sorted_array/rdfsa_test.go
similarity index 100%
rename from solutions/0026_remove_duplicates_from_sorted_array/rdfsa_test.go
rename to src/0026_remove_duplicates_from_sorted_array/rdfsa_test.go
diff --git a/solutions/0027_remove_element/remove_element.go b/src/0027_remove_element/remove_element.go
similarity index 100%
rename from solutions/0027_remove_element/remove_element.go
rename to src/0027_remove_element/remove_element.go
diff --git a/solutions/0027_remove_element/remove_element_test.go b/src/0027_remove_element/remove_element_test.go
similarity index 100%
rename from solutions/0027_remove_element/remove_element_test.go
rename to src/0027_remove_element/remove_element_test.go
diff --git a/solutions/0028_implement_strstr/implement_strstr.go b/src/0028_implement_strstr/implement_strstr.go
similarity index 100%
rename from solutions/0028_implement_strstr/implement_strstr.go
rename to src/0028_implement_strstr/implement_strstr.go
diff --git a/solutions/0028_implement_strstr/implement_strstr_test.go b/src/0028_implement_strstr/implement_strstr_test.go
similarity index 100%
rename from solutions/0028_implement_strstr/implement_strstr_test.go
rename to src/0028_implement_strstr/implement_strstr_test.go
diff --git a/solutions/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array.go b/src/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array.go
similarity index 100%
rename from solutions/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array.go
rename to src/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array.go
diff --git a/solutions/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array_test.go b/src/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array_test.go
similarity index 100%
rename from solutions/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array_test.go
rename to src/0033_search_in_rotated_sorted_array/search_in_rotated_sorted_array_test.go
diff --git a/solutions/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array.go b/src/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array.go
similarity index 100%
rename from solutions/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array.go
rename to src/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array.go
diff --git a/solutions/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array_test.go b/src/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array_test.go
similarity index 100%
rename from solutions/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array_test.go
rename to src/0034_find_first_and_last_position_of_element_in_sorted_array/find_first_and_last_position_of_element_in_sorted_array_test.go
diff --git a/solutions/0035_search_insert_position/search_insert_position.go b/src/0035_search_insert_position/search_insert_position.go
similarity index 100%
rename from solutions/0035_search_insert_position/search_insert_position.go
rename to src/0035_search_insert_position/search_insert_position.go
diff --git a/solutions/0035_search_insert_position/search_insert_position_test.go b/src/0035_search_insert_position/search_insert_position_test.go
similarity index 100%
rename from solutions/0035_search_insert_position/search_insert_position_test.go
rename to src/0035_search_insert_position/search_insert_position_test.go
diff --git a/solutions/0048_rotate_image/rotate_image.go b/src/0048_rotate_image/rotate_image.go
similarity index 100%
rename from solutions/0048_rotate_image/rotate_image.go
rename to src/0048_rotate_image/rotate_image.go
diff --git a/solutions/0048_rotate_image/rotate_image_test.go b/src/0048_rotate_image/rotate_image_test.go
similarity index 100%
rename from solutions/0048_rotate_image/rotate_image_test.go
rename to src/0048_rotate_image/rotate_image_test.go
diff --git a/solutions/0053_maximum_subarray/maximum_subarray.go b/src/0053_maximum_subarray/maximum_subarray.go
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diff --git a/solutions/0237_delete_node_in_a_linked_list/dniall.go b/src/0237_delete_node_in_a_linked_list/dniall.go
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index 12c4ade..f4ea8d5 100644
--- a/solutions/0237_delete_node_in_a_linked_list/dniall.go
+++ b/src/0237_delete_node_in_a_linked_list/dniall.go
@@ -24,7 +24,7 @@ type ListNode struct {
 // space complexity: O(1)
 func deleteNode(node *ListNode) {
 	// The linked list will have at least two elements.
-	// All the nodes' values will be unique.
+	// All of the nodes' values will be unique.
 	// The given node will not be the tail and it will always be a valid node of the linked list.
 	node.Val = node.Next.Val
 	node.Next = node.Next.Next
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diff --git a/solutions/148_Sort_List/sortlist.go b/src/148_Sort_List/sortlist.go
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diff --git a/solutions/304_Range_Sum_Query_2D/rsq.go b/src/304_Range_Sum_Query_2D/rsq.go
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diff --git a/solutions/README.md b/src/README.md
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rename from solutions/README.md
rename to src/README.md
index 44002aa..0ab80f3 100644
--- a/solutions/README.md
+++ b/src/README.md
@@ -1,8 +1,8 @@
-### Solutions for LeetCode algorithm problems, continually updating.
+### Solution for LeetCode algorithm problems, continually updating.
 
 |ID|Title && solution|Coefficient of difficulty|remarks|
 |:---:|:---:|:---:|:---:|
-|0001|[Two Sum](0001_two_sum/twosum.go)|Easy|*`array;`*  *`lookup table`*|
+|0001|[Two Sum](./0001_two_sum/twosum.go)|Easy|*`array;`*  *`lookup table`*|
 |0002|[Add Two Numbers](0002_add_two_numbers/add_two_numbers.go)|Medium|*`linked list`*|
 |0003|[Longest Substring Without Repeating Characters](0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters.go)|Medium|*`sliding window`*|
 |0004|[4. Median of Two Sorted Arrays](0004_median_of_two_sorted_arrays/motsa.go)|Hard|*`binary search`*|
diff --git a/utils/maxint_test.go b/utils/maxint_test.go
index 06cd6e7..e44248f 100644
--- a/utils/maxint_test.go
+++ b/utils/maxint_test.go
@@ -15,10 +15,3 @@ func TestCalcMaxInt(t *testing.T) {
 		}
 	}
 }
-
-func BenchmarkCalcMaxInt(b *testing.B) {
-	data := []int{3, 4, 67, 8}
-	for i := 0; i < b.N; i++ {
-		CalcMaxInt(data...)
-	}
-}