20. 有效的括号 https://leetcode.cn/problems/valid-parentheses
20. Valid Parentheses https://leetcode.com/problems/valid-parentheses
921. 使括号有效的最少添加 https://leetcode.cn/problems/minimum-add-to-make-parentheses-valid
921. Minimum Add to Make Parentheses Valid https://leetcode.com/problems/minimum-add-to-make-parentheses-valid
1541. 平衡括号字符串的最少插入次数 https://leetcode.cn/problems/minimum-insertions-to-balance-a-parentheses-string
1541. Minimum Insertions to Balance a Parentheses String https://leetcode.com/problems/minimum-insertions-to-balance-a-parentheses-string
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