Rename capital files

Author: neetcode-gh

c/0014-longest-common-prefix.c

@@ -0,0 +1,21 @@
+char * longestCommonPrefix(char ** strs, int strsSize){
+    int commonPrefixCount = 0;
+    int firstStrSize = strlen(strs[0]);
+
+    for(int i = 0; i < firstStrSize; i++)
+    {
+        for(int s = 1; s < strsSize; s++)
+        {
+            if(i == strlen(strs[s]) || strs[0][i] != strs[s][i])
+            {
+                // Add null terminator after the last common prefix char
+                strs[0][commonPrefixCount] = '\0';
+                return strs[0];
+            }
+        }
+
+        commonPrefixCount++;
+    }
+
+    return strs[0];
+}

c/0290-word-pattern.c

@@ -0,0 +1,72 @@
+typedef struct charToWord {
+    int ch;                  /* we'll use this field as the key */
+    char* word;
+    UT_hash_handle hh;      /* makes this structure hashable */
+}charToWord;
+
+typedef struct wordToChar {
+    char* word;            /* we'll use this field as the key */
+    int ch;
+    UT_hash_handle hh;    /* makes this structure hashable */
+}wordToChar;
+
+bool wordPattern(char * pattern, char * s){
+    charToWord* charToWordMap = NULL;
+    wordToChar* wordToCharMap = NULL;
+    char* word = NULL;
+
+    // Get the first word
+    word = strtok(s, " ");
+
+    for(size_t i = 0; i < strlen(pattern); i++)
+    {
+        charToWord* charToWordEntry = NULL;
+        wordToChar* wordToCharEntry = NULL;
+        int ch = pattern[i];
+
+        // If there is no words left (pattern > s)
+        if(word == NULL)
+        {
+            return false;
+        }
+
+        HASH_FIND_INT(charToWordMap, &ch, charToWordEntry);
+        HASH_FIND_STR(wordToCharMap, word, wordToCharEntry);
+
+        // If the char does exist in the map and the mapping is not the current word
+        if(charToWordEntry && strcmp(charToWordEntry->word, word) != 0)
+        {
+            return false;
+        }
+
+        // If the word does exist in the map and the mapping is not the current char
+       if(wordToCharEntry && wordToCharEntry->ch != ch)
+        {
+            return false;
+        }
+
+        /* Setup hash entries */
+        charToWordEntry = (charToWord*)malloc(sizeof(charToWord));
+        charToWordEntry->ch = ch;
+        charToWordEntry->word = word;
+
+        wordToCharEntry = (wordToChar*)malloc(sizeof(wordToChar));
+        wordToCharEntry->word = word;
+        wordToCharEntry->ch = ch;
+        
+        /* Add entries to the hashes */
+        HASH_ADD_INT(charToWordMap, ch, charToWordEntry);
+        HASH_ADD_STR(wordToCharMap, word, wordToCharEntry);
+
+        // Move to the next word
+        word = strtok(NULL, " ");
+    }
+
+    // If there is any words left (s > pattern)
+    if(word != NULL)
+    {
+        return false;
+    }
+
+    return true;
+}

c/0448-find-all-numbers-disappeared-in-an-array.c

@@ -0,0 +1,25 @@
+/**
+ * Note: The returned array must be malloced, assume caller calls free().
+ */
+int* findDisappearedNumbers(int* nums, int numsSize, int* returnSize){
+    int* disappearedNumbers = (int*)malloc(numsSize * sizeof(int)); // Allocate space for the worst case
+    *returnSize = 0; // Points to the first empty index in the array 
+
+    // Mark available numbers as negative
+    for(int i = 0; i < numsSize; i++)
+    {
+        int index = abs(nums[i]);
+        nums[index - 1] = -1 * abs(nums[index - 1]); 
+    }
+
+    // Find unmarked numbers (disappeared numbers)
+    for(int i = 0; i < numsSize; i++)
+    {
+        if(nums[i] > 0)
+        {
+            disappearedNumbers[(*returnSize)++] = i + 1; 
+        }
+    }
+
+    return disappearedNumbers;
+}

c/0554-brick-wall.c

@@ -0,0 +1,45 @@
+#define max(x, y) ((x) > (y) ? (x) : (y))
+
+typedef struct hash_entry {
+    int position;            /* we'll use this field as the key */
+    int gapCount;
+    UT_hash_handle hh;      /* makes this structure hashable */
+} hash_entry;
+
+int leastBricks(int** wall, int wallSize, int* wallColSize){
+    hash_entry* wallGapCountMap = NULL;
+    
+    for(int r = 0; r < wallSize; r++)
+    {
+        int position = 0;
+        for(int b = 0; b < *(wallColSize + r) - 1; b++)
+        {
+            position += wall[r][b];
+            
+            hash_entry* retrievedMapEntry;
+            HASH_FIND_INT(wallGapCountMap, &position, retrievedMapEntry);
+
+            // If the position already exists in the map then increment its gap count
+            if(retrievedMapEntry)
+            {
+                retrievedMapEntry->gapCount += 1;
+            }
+            else
+            {
+                // If the position doesn't exist in the map then create a new map entry for it and add it to the map
+                hash_entry* mapEntryToAdd = (hash_entry*)malloc(sizeof(hash_entry)); 
+                mapEntryToAdd->position = position;
+                mapEntryToAdd->gapCount = 1; 
+                HASH_ADD_INT(wallGapCountMap, position, mapEntryToAdd);
+            }
+        }
+    }
+
+    int maxGap = 0;
+    for (hash_entry* retrievedMapEntry = wallGapCountMap; retrievedMapEntry != NULL; retrievedMapEntry = retrievedMapEntry->hh.next)
+    {
+        maxGap = max(maxGap, retrievedMapEntry->gapCount);
+    }
+    
+    return wallSize - maxGap;
+}

cpp/0026-remove-duplicates-from-sorted-array.cpp

@@ -0,0 +1,15 @@
+class Solution {
+public:
+    int removeDuplicates(vector<int>& nums) {
+        int left = 1;
+
+        for(int right = 1; right < nums.size(); right++){
+            if(nums[right] != nums[right - 1]){
+                nums[left] = nums[right];
+                left++;
+            }
+        }
+
+        return left;
+    }
+};

cpp/0027-remove-element.cpp

@@ -0,0 +1,17 @@
+class Solution {
+public:
+    int removeElement(vector<int>& nums, int val) {
+        int n=nums.size();
+        int count=0;
+        for(int i=0;i<n;i++)
+        {
+            if(nums[i]!=val)
+            {
+                swap(nums[i],nums[count]);
+                count++;
+            }
+        }
+        
+        return count;
+    }
+};

cpp/0028-find-the-index-of-the-first-occurrence-in-a-string.cpp

@@ -0,0 +1,17 @@
+class Solution {
+public:
+    int strStr(string haystack, string needle) {
+        if(haystack.size()<needle.size()) return -1;
+        int found=0;
+        for(int i=0;i<haystack.size()-needle.size()+1;i++){
+            if(haystack[i]==needle[0]){
+                found=1;
+                for(int j=1;j<needle.size();j++){
+                    if(haystack[i+j]!=needle[j]){
+                        found=0;break;
+                    }
+                }if(found==1) return i;
+            }
+        }return -1;
+    }
+};

cpp/0067-add-binary.cpp

@@ -0,0 +1,28 @@
+class Solution {
+public:
+    string addBinary(string a, string b) {
+        string res;
+        int maxLen = a.size() > b.size() ? a.size() : b.size();
+        unsigned int carry = 0;
+
+        for(int i = 0; i < maxLen; i++)
+        {
+            unsigned int bitA = i < a.size() ? a[a.size() - i - 1] - '0' : 0;
+            unsigned int bitB = i < b.size() ? b[b.size() - i - 1] - '0' : 0;
+
+            unsigned int total = bitA + bitB + carry;
+            char sum = '0' + total % 2;
+            carry = total / 2;
+
+            // Add to the beginning of the string
+            res.insert(0, 1, sum);
+        }
+
+        if(carry)
+        {
+            res.insert(0, 1, '1');
+        }
+
+        return res;
+    }
+};

cpp/0075-sort-colors.cpp

@@ -0,0 +1,22 @@
+class Solution {
+public:
+    void sortColors(vector<int>& nums) {
+        int p1=0,p2=nums.size()-1;
+        for(int i=p1;i<=p2;i++)
+        {
+            if(nums[i]==0)
+            {
+                swap(nums[i],nums[p1]);
+                p1++;
+            }
+            if(nums[i]==2)
+            {
+                swap(nums[i],nums[p2]);
+                p2--;
+                i--;
+            }
+        }
+        
+        
+    }
+};

cpp/0088-merge-sorted-array.cpp

@@ -0,0 +1,31 @@
+class Solution {
+public:
+    void merge(vector<int>& nums1, int m, vector<int>& nums2, int n) {
+        int j=0;
+        int i=0;
+        if(n==0) return;
+        if(m==0)
+        {  
+         for(int i = 0; i < n; i++){
+                nums1[i] = nums2[i];
+            } return;
+        } 
+        while(i<m)
+        {
+            if(nums1[i]>nums2[j])
+            {
+                swap(nums1[i],nums2[j]);
+                sort(nums2.begin(),nums2.end());
+            }
+            i++;
+        }
+        j=0;
+        while(i<m+n)
+        {
+            nums1[i] = nums2[j];
+            j++;
+            i++;
+        }
+        
+    }
+};

cpp/0205-isomorphic-strings.cpp

@@ -0,0 +1,23 @@
+/*Given two strings s and t, determine if they are isomorphic.
+
+Two strings s and t are isomorphic if the characters in s can be replaced to get t.
+
+All occurrences of a character must be replaced with another character while preserving the order of characters. No two characters may map to the same character, but a character may map to itself.
+
+ */
+class Solution {
+public:
+    bool isIsomorphic(string s, string t) {
+       unordered_map<char,vector<int>>m1;
+         unordered_map<char,vector<int>>m2;
+        for(int i=0;i<s.length();i++){
+            m1[s[i]].push_back(i);
+             m2[t[i]].push_back(i);
+            
+            if(m1[s[i]]!=m2[t[i]])
+                return false;
+        }
+        return true;
+        
+    }
+};

cpp/0344-reverse-string.cpp

@@ -0,0 +1,13 @@
+class Solution {
+public:
+    void reverseString(vector<char>& s) {
+        int left = 0, right = s.size() - 1;
+        
+        while (left < right){
+            swap(s[left], s[right]);
+            
+            left++;
+            right--;
+        }
+    }
+};

cpp/0665-non-decreasing-array.cpp

@@ -0,0 +1,18 @@
+class Solution {
+public:
+    bool checkPossibility(vector<int>& nums) {
+        int count = 0;
+        for(int i=1;i<nums.size();i++){
+            if(nums[i-1]>nums[i]){
+                count++;
+                if(i>=2&&nums[i-2]>nums[i]){
+                    nums[i]=nums[i-1];
+                }
+                else{
+                    nums[i-1]=nums[i];
+                }
+            }
+        }
+        return count<=1;
+    }
+};

cpp/1985-find-the-kth-largest-integer-in-the-array.cpp

@@ -0,0 +1,15 @@
+class Solution {
+private:
+    static bool st(string &a,string &b){
+        if(a.size()==b.size()) return a<b;
+        return a.size()<b.size();
+    }
+    
+    
+public:
+    string kthLargestNumber(vector<string>& nums, int k) {
+        sort(nums.begin(),nums.end(),st);
+        return nums[nums.size()-k];
+        
+    }
+};