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top-100-liked/59/leetcode_test.go

@@ -0,0 +1,48 @@
+package top100liked
+
+import (
+	"fmt"
+	"testing"
+)
+
+// https://leetcode.cn/problems/generate-parentheses/description/?envType=study-plan-v2&envId=top-100-liked
+
+func generateParenthesis(n int) []string {
+	res := []string{}
+	r := []byte{}
+	num_l := 0
+	num_r := 0
+
+	var helper func()
+	helper = func() {
+		if num_l < n {
+			r = append(r, '(')
+			num_l++
+			helper()
+			num_l--
+			r = r[:len(r)-1]
+		}
+		if num_l > num_r {
+			r = append(r, ')')
+			num_r++
+			helper()
+			num_r--
+			r = r[:len(r)-1]
+		}
+		if num_l == n && num_r == n {
+			res = append(res, string(r))
+		}
+	}
+
+	helper()
+
+	return res
+}
+
+func Test(t *testing.T) {
+	fmt.Printf("%+v\n", generateParenthesis(3))
+}
+
+func Test2(t *testing.T) {
+	fmt.Printf("%+v\n", generateParenthesis(1))
+}