1021.Remove Outermost Parentheses - Leetcode题解

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231.Power of Two

232.Implement Queue Using Stack

234.Palindrome Linked List

237.Delete Node in a Linked List

240.Search a 2D Matrix II

242.Valid Anagram

257.Binary Tree Paths

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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342.Power of Four

344.Reverse String

345.Reverse Vowels of a String

349.Intersection of Two Arrays

350.Intersection of Two Arrays II

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374.Guess Number Higher or Lower

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415.Add Strings

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429.N Ary Tree Level Order Traversal

434.Number of Segments in a String

437.Path Sum III

438.Find All Anagrams in a String

441.Arranging Coins

443.String Compression

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448.Find All Numbers Disappeared in an Array

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461.Hamming Distance

463.Island Perimeter

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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

575.Distribute Candies

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645.Set Mismatch

653.Two Sum IV - Input is a BST

654.Maximum Binary 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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682.Baseball Game

686.Repeated String Match

687.Longest Univalue Path

690.Employee Importance

693.Binary Number with Alternating Bits

696.Count Binary Substring

697.Degree of an Array

700.Search in a Binary Search Tree

701.Insert Into a Binary Search Tree

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706.Design Hashmap

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720.Longest Word in Dictionary

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728.Self Dividing Numbers

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746.Min Cost Climbing Stairs

747.Largest Number At Least Twice Of Others

748.Shortest Completing Word

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766.Toeplitz Matrix

771.Jewels and Stones

783.Minimum Distance Between BST Nodes

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814.Binary Tree Pruning

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829.Consecutive Numbers Sum

830.Position of Large Groups

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833.Find And Replace in String

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859.Buddy Strings

860.Lemonade Change

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916.Word Subsets

917.Reverse Only Letters

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994.Rotting Oranges

997.Find the Town Judge

999.Available Captures for Rook

1002.Find Common Characters

1005.Maximise Sum of Array after K Negations

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。
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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。
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​
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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 。
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​
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​
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示例 1：
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​
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输入："(()())(())"
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输出："()()()"
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解释：
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输入字符串为 "(()())(())"，原语化分解得到 "(()())" + "(())"，
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删除每个部分中的最外层括号后得到 "()()" + "()" = "()()()"。
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示例 2：
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​
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输入："(()())(())(()(()))"
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输出："()()()()(())"
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解释：
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输入字符串为 "(()())(())(()(()))"，原语化分解得到 "(()())" + "(())" + "(()(()))"，
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删除每隔部分中的最外层括号后得到 "()()" + "()" + "()(())" = "()()()()(())"。
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示例 3：
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​
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输入："()()"
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输出：""
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解释：
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输入字符串为 "()()"，原语化分解得到 "()" + "()"，
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删除每个部分中的最外层括号后得到 "" + "" = ""。
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​
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提示：
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​
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S.length <= 10000
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S[i] 为 "(" 或 ")"
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S 是一个有效括号字符串
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解法，用栈判断，然后去除最外层括号：
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class Solution {
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public:
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    string removeOuterParentheses(string S) {
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        if(S=="") return S;
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        stack<char> pri;
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        string res;
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        int flag=0;
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        for(char c :S)
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        {
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​
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            if(c=='(')
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            {
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                if(!pri.empty() || flag)
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                {
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                    pri.push(c);
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                    res+=c;
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                }
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                else
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                    flag=1;
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            }
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            else if(c==')')
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            {
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                if(pri.empty())
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                    flag=0;
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                else
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                {
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                    res+=c;
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                    pri.pop();
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            }
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            }
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​
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        //    cout<<pri.size()<<endl;
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        }
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        return res;
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    }
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};
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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

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