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top-100-liked/58/leetcode_test.go

@@ -0,0 +1,53 @@
+package top100liked
+
+import (
+	"fmt"
+	"testing"
+)
+
+// https://leetcode.cn/problems/combination-sum/?envType=study-plan-v2&envId=top-100-liked
+
+func combinationSum(candidates []int, target int) [][]int {
+	res := [][]int{}
+	sum := 0
+	r := []int{}
+
+	var helper func(strat int)
+	helper = func(start int) {
+		for i := start; i < len(candidates); i++ {
+			v := candidates[i]
+			if sum+v == target {
+				cp := make([]int, len(r))
+				copy(cp, r)
+				cp = append(cp, v)
+				res = append(res, cp)
+				continue
+			} else if sum+v < target {
+				r = append(r, v)
+				sum += v
+				helper(i)
+				sum -= v
+				r = r[:len(r)-1]
+			}
+		}
+	}
+
+	helper(0)
+	return res
+}
+
+func Test(t *testing.T) {
+	fmt.Printf("%+v\n", combinationSum([]int{2, 3, 6, 7}, 7))
+}
+
+func Test2(t *testing.T) {
+	fmt.Printf("%+v\n", combinationSum([]int{2, 3, 5}, 8))
+}
+
+func Test3(t *testing.T) {
+	fmt.Printf("%+v\n", combinationSum([]int{2}, 1))
+}
+
+func Test4(t *testing.T) {
+	fmt.Printf("%+v\n", combinationSum([]int{4, 2, 8}, 8))
+}