题解 | #括号生成#

package main

/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 *
 * @param n int整型
 * @return string字符串一维数组
 */
func generateParenthesis(n int) []string {
	var result []string
	backtrack(&result, "", 0, 0, n)
	return result
}

func backtrack(result *[]string, cur string, open, close, max int) {
	if len(cur) == max*2 {
		*result = append(*result, cur)
		return
	}
	if open < max {
		backtrack(result, cur+"(", open+1, close, max)
	}
	if close < open {
		backtrack(result, cur+")", open, close+1, max)
	}
}