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parentheses
Generate
Parentheses
我的代码实现(Python):classSolution(object):defgenerateParenthesis(self,n):""":typen:int:rtype:List[str]"""ifn==0:return[]l=[]res=[]self.a(res,l,n)returnresdefa(self,res,l,n):iflen(l)==2*n:l=''.join(l)res.ap
贰拾贰画生
·
2021-05-14 05:00
LeetCode每日一题:longest valid
parentheses
问题描述Givenastringcontainingjustthecharacters'('and')',findthelengthofthelongestvalid(well-formed)parenthesessubstring.For"(()",thelongestvalidparenthesessubstringis"()",whichhaslength=2.Anotherexamplei
yoshino
·
2021-05-13 12:11
Valid
Parentheses
classSolution{publicbooleanisValid(Strings){Stackstack=newStack<>();for(charc:s.toCharArray()){if(c=='('||c=='['||c=='{'){stack.push(c);}if(c==')'){if(stack.isEmpty()||stack.pop()!='('){returnfalse;}}
Wenyue_offer
·
2021-05-12 17:24
Different Ways to Add
Parentheses
解题报告
Description:Givenastringofnumbersandoperators,returnallpossibleresultsfromcomputingallthedifferentpossiblewaystogroupnumbersandoperators.Thevalidoperatorsare+,-and*.Example:Input:"2-1-1".((2-1)-1)=0(2
黑山老水
·
2021-05-12 11:09
Longest Valid
Parentheses
usingdynamicprogramming***s=’(()(())’dp[7]=以s[6]为结尾的longestvalidparenthesessubstring长度j=7-2-dp[6]=5-2=3j>0ands[3]=’(‘d[7]=d[6]+2+d[3]=2+2+2=6s=’(())())’j=7-2-dp[6]=5-2=3s[3]!=’(‘d[7]=0****classSolutio
阿团相信梦想都能实现
·
2021-05-11 07:21
LeetCode #241 Different Ways to Add
Parentheses
为运算表达式设计优先级
241DifferentWaystoAddParentheses为运算表达式设计优先级Description:Givenastringofnumbersandoperators,returnallpossibleresultsfromcomputingallthedifferentpossiblewaystogroupnumbersandoperators.Thevalidoperatorsare
air_melt
·
2021-05-10 09:44
Valid
Parentheses
20.ValidParentheses题目:https://leetcode.com/problems/valid-
parentheses
/难度:Easy虽然知道肯定是用stack来解决,但是我是看了hint
oo上海
·
2021-05-10 04:54
Valid
Parentheses
题解
题目描述Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Thebracketsmustcloseinthecorrectorder,"()"and"()[]{}"areallvalidbut"(]"and"([)]"arenot.假设我们有一串(,),
BookThief
·
2021-05-06 17:34
Leetcode 22 括号生成
))","(()())","(())()","()(())","()()()"]来源:力扣(LeetCode)链接:https://leetcode-cn.com/problems/generate-
parentheses
禾木清清
·
2021-05-05 17:51
Parentheses
Amazon面试题:判断有多少对括号,有落单的就return-1,否则return多少对,基本用个stack就搞定EX:(())()(),return4(()())(,retrurn-1评:与leetcode的题不一样,但testcase可以用32的测试,下面是自己写的,亲测可用。另外附加20,22题相似题,感觉需要会,20题相似,22题backtracking。publicclassSoluti
夜皇雪
·
2021-05-03 12:16
673 -
Parentheses
Balance
题意就是输入一行包含()和[]的字符串,检查每对括号是否匹配得上,能就Yes否则No。然而题目好坑啊根本没说输入字符串里会含有空格,所以一开始用cin读取string总是蜜汁WA,调试了很久才发现得用getline,而且要注意一开始用cin读取一个整数n后,换行符会被cin忽略从而留在输入缓冲区里,下面getline碰到换行符就直接结束不读了,相当于多了一个空串。所以在cin完整数n后要再加一句g
不会积
·
2021-05-01 01:56
uva673
Parentheses
Balance
题目:Youaregivenastringconsistingofparentheses()and[].Astringofthistypeissaidtobecorrect:(a)ifitistheemptystring(b)ifAandBarecorrect,ABiscorrect,(c)ifAiscorrect,(A)and[A]iscorrect.Writeaprogramthattakes
科学旅行者
·
2021-04-29 23:25
[leetcode] 20/22 Vaild
parentheses
/generate
parentheses
Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Aninputstringisvalidif:Openbracketsmustbeclosedbythesametypeofbrackets.Openbracketsmustbeclosedintheco
Kevifunau
·
2021-04-28 10:18
Different Ways to Add
Parentheses
Givenastringofnumbersandoperators,returnallpossibleresultsfromcomputingallthedifferentpossiblewaystogroupnumbersandoperators.Thevalidoperatorsare+,-and*.Example1Input:"2-1-1".((2-1)-1)=0(2-(1-1))=2Out
我是你的果果呀
·
2021-04-27 06:36
Valid
Parentheses
ValidParenthesesGivenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Thebracketsmustcloseinthecorrectorder,"()"and"()[]{}"areallvalidbut"(]"and"([)]"arenot
sherwin29
·
2021-04-26 18:39
Longest Valid
Parentheses
最长有效括号
题目链接tag:Hard;DynamicProgramming;question: Givenastringcontainingjustthecharacters'('and')',findthelengthofthelongestvalid(well-formed)parenthesessubstring.Example1:Input:"(()"Output:2Explanation:Thel
xingzai
·
2021-04-24 21:53
【leetcode刷题笔记】032.Longest Valid
Parentheses
日期:20180914题目描述:Givenastringcontainingjustthecharacters'('and')',findthelengthofthelongestvalid(well-formed)parenthesessubstring.Example1:Input:"(()"Output:2Explanation:Thelongestvalidparenthesessubst
常恒毅
·
2021-04-19 20:22
leetcode 刷题笔记之——20.有效的括号valid-
parentheses
题目描述:给定一个只包括'(',')','{','}','[',']'的字符串,判断字符串是否有效。有效字符串需满足:左括号必须用相同类型的右括号闭合。左括号必须以正确的顺序闭合。注意空字符串可被认为是有效字符串。示例1:输入:"()"输出:true示例2:输入:"()[]{}"输出:true示例3:输入:"(]"输出:false示例4:输入:"([)]"输出:false来源:力扣(LeetCod
Phil553
·
2021-04-19 06:32
D标点符号的运用7(Punctuation)----
Parentheses
圆括号 Brackets括号
Parentheses
圆括号()(1)在一句子中插入字或语句,可使用圚括号,正如用dashes破折号一样,但用折号会突出插入句的意思,而用圆括号则会令插入句不明显,只作补充资料。
小美Prisca
·
2021-04-14 07:18
Generate
Parentheses
Lateagain.MEDIUMlevelagain.Butthisoneisinteresting.DESCRIPTION:Givennpairsofparentheses,writeafunctiontogenerateallcombinationsofwell-formedparentheses.Forexample,givenn=3,asolutionsetis:["((()))","((
Shira0905
·
2021-03-11 19:25
import apriori导入出现错误SyntaxError: Missing
parentheses
in call to ‘print‘. Did you mean print(freqSet-
importapriori'''Traceback(mostrecentcalllast):File"C:\Users\Administrator\anaconda3\lib\site-packages\IPython\core\interactiveshell.py",line3343,inrun_codeexec(code_obj,self.user_global_ns,self.user_n
缘 源 园
·
2021-03-09 13:38
Bug
python
bug
Valid
Parentheses
(cpp)
题目解法:stack繁琐的写法classSolution{public:boolisValid(strings){if(s.size()%2!=0)returnfalse;stackst;for(autoc:s){if(c=='('||c=='['||c=='{'){st.push(c);}elseif(c==')'){if(st.empty()||st.top()!='(')returnfals
努利!奋斗!
·
2020-12-27 09:27
Leetcode
字符串
Leetcode
其他类型题目
stack
leetcode
c++
Generate
Parentheses
classSolution{publicListgenerateParenthesis(intn){Listans=newArrayListans,intn,intleft,intright,Stringprefix){if(prefix.length()==2*n){ans.add(prefix);return;}if(left>right){generator(ans,n,left,right
zhfang
·
2020-12-24 10:24
leetcode
Longest Valid
Parentheses
Givenastringcontainingjustthecharacters'('and')',findthelengthofthelongestvalid(well-formed)parenthesessubstring.Example1:Input:"(()"Output:2Explanation:Thelongestvalidparenthesessubstringis"()"Exampl
葡萄肉多
·
2020-10-10 04:50
【Leetcode】20、Valid
Parentheses
Valid系列。。这次是个左右括号匹配的题目,很容易想到用栈,先入后出的属性。easy题。#include#includeusingnamespacestd;boolisValid(strings){stackstk;intstart=0,size=s.size();for(;start
Cloud丶Shao
·
2020-09-17 05:47
算法题
leetcode题解:第301题Remove Invalid
Parentheses
https://leetcode-cn.com/problems/remove-invalid-
parentheses
/文章目录解法一、BFS代码解法二、回溯代码解法三、有限制的回溯代码解法一、BFS这题要求所有的解
chenf99
·
2020-09-16 20:26
算法
[LeetCode]Generate
Parentheses
题目要求如下:Givennpairsofparentheses,writeafunctiontogenerateallcombinationsofwell-formedparentheses.Forexample,givenn=3,asolutionsetis:"((()))","(()())","(())()","()(())","()()()"这道题有点结合“ValidParentheses”
zhouworld16
·
2020-09-16 06:01
LeetCode
[LeetCode]Valid
Parentheses
题目要求如下:Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Thebracketsmustcloseinthecorrectorder,"()"and"()[]{}"areallvalidbut"(]"and"([)]"arenot.这一题是典型的使
zhouworld16
·
2020-09-16 06:01
LeetCode
Python_SyntaxError: Missing
parentheses
in call to 'print'. Did you mean print(response .body)
描述:使用scrapy中执行命令时候出现以下错误。SyntaxError:Missingparenthesesincallto'print'.Didyoumeanprint(response.body)解释:SytRealError:调用“打印”时缺少括号。你是指打印response.body?因为我的python版本是3.6,而在python3.6中使用print命令是需要加括号的
Urila
·
2020-09-16 03:50
python
错误整理
python问题及解决方案
scrapy
LeetCode #20 Valid
Parentheses
DescriptionGivenastringcontainingjustthecharacters‘(‘,‘)’,‘{‘,‘}’,‘[’and‘]’,determineiftheinputstringisvalid.Thebracketsmustcloseinthecorrectorder,“()”and“()[]{}”areallvalidbut“(]”and“([)]”arenot.Anal
小-立子
·
2020-09-15 23:01
leetcode
Valid
Parentheses
简单题,吃饭前写着玩玩importjava.util.*;classSolution{publicbooleanisValid(Strings){if(s.length()==0)returntrue;booleanret=true;intlength=s.length();Stackstack=newStack();for(inti=0;i
WindowsSucks
·
2020-09-15 12:56
算法
Generate
Parentheses
括号生成
Givennpairsofparentheses,writeafunctiontogenerateallcombinationsofwell-formedparentheses.Forexample,givenn=3,asolutionsetis:["((()))","(()())","(())()","()(())","()()()"]根据题目要求计算出所有可能性,我们使用回溯来处理,首先确定几
weixin_34061482
·
2020-09-15 05:59
LeetCode 22 Generate
Parentheses
(生成括号)
翻译给定一个括号序列,写一个函数用于生成正确形式的括号组合。例如,给定n=3,一个解决方案集是:"((()))","(()())","(())()","()(())","()()()"原文Givennpairsofparentheses,writeafunctiontogenerateallcombinationsofwell-formedparentheses.Forexample,givenn
weixin_33840661
·
2020-09-15 05:21
leetcode 22. 括号生成(python)
))","(()())","(())()","()(())","()()()"]来源:力扣(LeetCode)链接:https://leetcode-cn.com/problems/generate-
parentheses
vs974532452
·
2020-09-15 05:51
leetcode
leetcode
python
Leetcode 22. 括号生成(回溯) —— python
=3,生成结果为:[“((()))”,“(()())”,“(())()”,“()(())”,“()()()”]链接:https://leetcode-cn.com/problems/generate-
parentheses
2
_missTu_
·
2020-09-15 05:40
leetcode
Generate
Parentheses
-回溯|递归
原题链接:22.GenerateParentheses【思路-Java、Python】递归实现采用递归方式,添加左括号的条件是左括号数量小于n,添加右括号的条件是右括号数小于左括号数:publicclassSolution{publicListgenerateParenthesis(intn){ Listres=newArrayList(); dfs(res,"",n,0,0);ret
Code_Granker
·
2020-09-15 04:29
LeetCode
Leetcode 22 Generate
Parentheses
括号生成,回溯
其实回溯,我本来就不熟悉,只知道和栈相关,这道题被困住了,我就看了一遍,回溯算法的介绍,理解了其中关键和空间结构的选择有关,最常见的就是树结构。树的深度遍历,是有层次的(level),是可以倒退的(level--),哈哈,同时这道题有个局限就是,left(左括号)一定要大于等于right(右括号)。题目要求:Givennpairsofparentheses,writeafunctiontogene
ata_123
·
2020-09-15 04:33
leetcode
Leetcode 1190.反转每对括号间的子串(Reverse Substrings Between Each Pair of
Parentheses
)
Leetcode1190.反转每对括号间的子串1题目描述(Leetcode题目链接) 给出一个字符串s(仅含有小写英文字母和括号)。请你按照从括号内到外的顺序,逐层反转每对匹配括号中的字符串,并返回最终的结果。注意,您的结果中不应包含任何括号。输入:s="(abcd)"输出:"dcba"输入:s="(ed(et(oc))el)"输出:"leetcode"输入:s="a(bcdefghijkl(m
就叫昵称吧
·
2020-09-15 01:19
Leetcode
栈
leetcode
算法
Reverse Substrings Between Each Pair of
Parentheses
LeetCode-1190.ReverseSubstringsBetweenEachPairofParenthesesYouaregivenastringsthatconsistsoflowercaseEnglishlettersandbrackets.Reversethestringsineachpairofmatchingparentheses,startingfromtheinnermost
Bob__yuan
·
2020-09-15 00:13
#
编程题
LeetCode
Algorithm
leetcode20:Valid
Parentheses
ValidParenthesesGivenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Thebracketsmustcloseinthecorrectorder,"()"and"()[]{}"areallvalidbut"(]"and"([)]"arenot
GODBAR
·
2020-09-14 22:54
leetcode
leetcode
算法
用正则判断配对的“()”?没问题,一行搞定
&
parentheses
))*\))))\(、\)间的空格自己去掉一下。以后直接用(?&
parentheses
)就行。什么?''和“”里的()怎么办?(?(DEFINE)(?(?>'(?:\\.|(?
taodm
·
2020-09-14 20:45
C++
boost
C/C++
Let's Line Up
Parentheses
(模拟+栈)
一道训练赛上的题目,当时写了一个多小时才写出来,先看题面:Givenastringofparentheses,youaretousetheverticalbar(’|’)andunderscore(’_’)characterstoconnectthematchingparentheses.TheInput:Thefirstinputlinewillbeapositiveintegern,indic
给岁月以文明
·
2020-09-14 05:19
个人题解
字符串
栈
LeetCode-20 有效的括号
LeetCode题目题目链接:https://leetcode-cn.com/problems/valid-
parentheses
/给定一个只包括'(',')','{','}','[',']'的字符串,
pink baby
·
2020-09-14 05:59
算法
Different Ways to Add
Parentheses
Givenastringofnumbersandoperators,returnallpossibleresultsfromcomputingallthedifferentpossiblewaystogroupnumbersandoperators.Thevalidoperatorsare+,-and*.Example1:Input:"2-1-1"Output:[0,2]Explanation:(
i_chase
·
2020-09-13 16:25
数据结构与算法:第五周作业一:有效的括号
题目描述链接:https://leetcode-cn.com/problems/valid-
parentheses
/思路:利用括号匹配原理:即如果能匹配的化,右扩号一定与左边最后一个对应的左括号匹配,就是栈的后进先用
superth_
·
2020-09-13 14:50
Valid
Parentheses
- javascript
/***@param{string}s*@return{boolean}*/varisValid=function(s){varstack=[];for(vari=0;i
lstrue
·
2020-09-13 12:14
技术文章
LeetCode刷题笔记--20.valid-
parentheses
我用C++写的,下面是通过的代码。从昨天开始调试的,今天早上刚找到原因,已经提交了,过程中间一直有问题。我想记录下来的是stack的用法:stack后面一定要写,不然会报错其中长度的话是size()而不是length().pop()表示弹出push(item)表示压入top()表示最顶层的元素一直有问题的地方是在下面加//*的地方。之前直接用c和top()比,然后就一直得到false,无论如何tr
vivian0239
·
2020-09-13 03:34
算法题-最长有效括号
题目链接:https://leetcode-cn.com/problems/longest-valid-
parentheses
/题目描述:给定一个只包含‘(’和‘)’的字符串,找出最长的包含有效括号的子串的长度
北方有位苏公子
·
2020-09-12 23:08
算法
Longest Valid
Parentheses
1、题目描述给出一个只含有(和)的字符串,返回最长的括号匹配合法的子串。2、思路动态规划。dp[i]指的是以位置i结尾的最长合法子串的长度。初始化:dp[i]=0状态转移:只有s[i]==),dp[i]才有可能大于0.1)s[i-1]==(,dp[i]=dp[i-2]+2;2)s[i-1]==),s[i-dp[i-1]-1]==(dp[i]=dp[i-1]+2;ifi-dp[i-1]-2>=0dp
zibingling777
·
2020-09-12 21:00
刷题笔记
Longest Valid
Parentheses
【栈&动态规划】
它的标题基本就是题目了,找出连续的最长有效括号的长度,再看一下原题的两个栗子就更明显了,尤其是第二个栗子中的()()部分,更是此题的一个关键,后面还会经常提起。这道题题意相当简单,思路相当简洁,代码相当简短,但是感觉想起来没有那么简单,做完有一种相当巧妙的感觉,所以分享出来。Givenastringcontainingjustthecharacters'('and')',findthelength
zhaoqinmuxue
·
2020-09-12 21:49
LeetCode
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