Merge pull request neetcode-gh#1228 from MaratKhakim/40-Comb-Sum-kt

Kotlin: 40. Combination Sum

kotlin/40-Combination-Sum.kt

@@ -0,0 +1,27 @@
+class Solution {
+ fun combinationSum2(candidates: IntArray, target: Int): List<List<Int>> {
+ val res = mutableListOf<List<Int>>()
+ candidates.sort()
+ dfs(candidates, target, 0, mutableListOf<Int>(), res)
+ return res
+ }
+
+ fun dfs(nums: IntArray, target: Int, idx: Int, list: MutableList<Int>, res: MutableList<List<Int>>) {
+
+ if (target == 0) {
+ res.add(ArrayList(list))
+ return
+ }
+
+ if (idx >= nums.size || target < 0)
+ return
+
+ for (i in idx..nums.size-1) {
+ if (i == idx || nums[i] != nums[i-1]) {
+ list.add(nums[i])
+ dfs(nums, target - nums[i], i+1, list, res)
+ list.removeAt(list.size-1)
+ }
+ }
+ }
+}