1021.Remove Outermost Parentheses - Leetcode题解

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232.Implement Queue Using Stack

234.Palindrome Linked List

237.Delete Node in a Linked List

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263.Ugly Numbers

268.Missing Number

278.First Bad Version

284.Peeking Iterator

290.Word Pattern

303.Range Sum Query Immutable

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345.Reverse Vowels of a String

349.Intersection of Two Arrays

350.Intersection of Two Arrays II

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415.Add Strings

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429.N Ary Tree Level Order Traversal

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437.Path Sum III

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441.Arranging Coins

443.String Compression

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535.Encode and Decode TinyURL

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543.Diameter of Binary Tree

551.Student Attendace Record I

557.Reverse Words in a String

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561.Array Partition I

563.Binary Tree Tilt

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572.Subtree of Another Tree

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661.Image Smoother

665.Non-Decreasing Array

669.Trim a Binary Search Tree

671.Second Minimum Node in a Binary Tree

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687.Longest Univalue Path

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696.Count Binary Substring

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700.Search in a Binary Search Tree

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720.Longest Word in Dictionary

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814.Binary Tree Pruning

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859.Buddy Strings

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994.Rotting Oranges

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1008.Construct Binary Search Tree from Preorder Traversal

1021.Remove Outermost Parentheses

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面试题 16.01

面试题 16.18

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1021.Remove Outermost Parentheses

1021.Remove Outermost Parentheses
难度:Easy
有效括号字符串为空 ("")、"(" + A + ")" 或 A + B，其中 A 和 B 都是有效的括号字符串，+ 代表字符串的连接。例如，""，"()"，"(())()" 和 "(()(()))" 都是有效的括号字符串。
如果有效字符串 S 非空，且不存在将其拆分为 S = A+B 的方法，我们称其为原语（primitive），其中 A 和 B 都是非空有效括号字符串。
给出一个非空有效字符串 S，考虑将其进行原语化分解，使得：S = P_1 + P_2 + ... + P_k，其中 P_i 是有效括号字符串原语。
​
对 S 进行原语化分解，删除分解中每个原语字符串的最外层括号，返回 S 。
​
 
​
示例 1：
​
输入："(()())(())"
输出："()()()"
解释：
输入字符串为 "(()())(())"，原语化分解得到 "(()())" + "(())"，
删除每个部分中的最外层括号后得到 "()()" + "()" = "()()()"。
示例 2：
​
输入："(()())(())(()(()))"
输出："()()()()(())"
解释：
输入字符串为 "(()())(())(()(()))"，原语化分解得到 "(()())" + "(())" + "(()(()))"，
删除每隔部分中的最外层括号后得到 "()()" + "()" + "()(())" = "()()()()(())"。
示例 3：
​
输入："()()"
输出：""
解释：
输入字符串为 "()()"，原语化分解得到 "()" + "()"，
删除每个部分中的最外层括号后得到 "" + "" = ""。
 
​
提示：
​
S.length <= 10000
S[i] 为 "(" 或 ")"
S 是一个有效括号字符串
解法，用栈判断，然后去除最外层括号：
class Solution {
public:
    string removeOuterParentheses(string S) {
        if(S=="") return S;
        stack<char> pri;
        string res;
        int flag=0;
        for(char c :S)
        {
​
            if(c=='(')
            {
                if(!pri.empty() || flag)
                {
                    pri.push(c);
                    res+=c;
                }
                else
                    flag=1;
            }
                
            else if(c==')')
            {
                if(pri.empty())
                    flag=0;
                else
                {
                    res+=c;
                    pri.pop();
            }
            }
​
        //    cout<<pri.size()<<endl;
        }
        return res;
    }
};
执行用时 : 12 ms, 在Remove Outermost Parentheses的C++提交中击败了83.57% 的用户 内存消耗 : 9.1 MB, 在Remove Outermost Parentheses的C++提交中击败了45.88% 的用户

1008.Construct Binary Search Tree from Preorder Traversal

1025.Divisor Game

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