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parentheses
Longest Valid
Parentheses
这题看起来简单但是容易漏很多testcase。错误的思路一开始我的思路是:遇到左括号就入栈、计数;遇到右括号先检查栈是否为空;不为空就出栈、计数,为空就结束本次计数上面这种思路有漏洞,比如当(()的情况时,返回的结果将会是3正确的方式遇到左括号就把它的index压栈,遇到右括号先检查栈是否为空,为空就说明是())这种情形,所以把start右移一位,直到找到一个(为止;不为空就pop出一个元素,这时
DrunkPian0
·
2019-11-04 23:25
LeetCode 20 [Valid
Parentheses
]
原题给定一个字符串所表示的括号序列,包含以下字符:'(',')','{','}','['and']',判定是否是有效的括号序列。样例括号必须依照"()"顺序表示,"()[]{}"是有效的括号,但"([)]"则是无效的括号。解题思路经典的利用一个栈进行匹配校验。如果current是左符号,入栈如果current是右符号此时栈空,返回False栈顶出栈与current比较,不相等则返回False最后检
Jason_Yuan
·
2019-11-04 22:11
Different Ways to Add
Parentheses
Givenastringofnumbersandoperators,returnallpossibleresultsfromcomputingallthedifferentpossiblewaystogroupnumbersandoperators.Thevalidoperatorsare+,-and*.Example1Input:"2-1-1".((2-1)-1)=0(2-(1-1))=2Out
Jeanz
·
2019-11-04 04:01
Longest Valid
Parentheses
Givenastringcontainingjustthecharacters'('and')',findthelengthofthelongestvalid(well-formed)parenthesessubstring.For"(()",thelongestvalidparenthesessubstringis"()",whichhaslength=2.Anotherexampleis")(
Jeanz
·
2019-11-03 21:08
Valid
Parentheses
括号开闭
Easy,DynamicProgrammingQuestion给定string只含'(',')','{','}','[',']',判断string是否validExample:"()[]{}":true"([)]":falseSolution论坛一个coder的方法,做减法,把配对的括号一一去除。想法非常简单,缺点是complexity会比较高。classSolution(object):defi
穿越那片海
·
2019-11-03 00:38
Valid
Parentheses
Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Thebracketsmustcloseinthecorrectorder,"()"and"()[]{}"areallvalidbut"(]"and"([)]"arenot.Solution:classS
a_void
·
2019-11-01 00:59
Longest Valid
Parentheses
笔记
Givenastringcontainingjustthecharacters'('and')',findthelengthofthelongestvalid(well-formed)parenthesessubstring.For"(()",thelongestvalidparenthesessubstringis"()",whichhaslength=2.Anotherexampleis")(
赵智雄
·
2019-10-31 23:37
Valid
Parentheses
利用FILO的STACK一切都是那么美好classSolution{publicbooleanisValid(Strings){Stackstack=newStack<>();for(inti=0;i
misleadingrei
·
2019-10-31 20:10
Minimum Add to Make
Parentheses
Valid 使括号有效的最少添加
GivenastringSof'('and')'
parentheses
,weaddtheminimumnumberofparentheses('('or')',andinanypositions)sothattheresultingparenthesesstringisvalid.Formally
Grandyang
·
2019-10-31 04:00
Valid
Parentheses
#defineSTACK_SIZE10000structstack{chara[STACK_SIZE];inttop;};voidpush(structstack*s,charc){if(s->top==STACK_SIZE-1)return;else{s->top++;s->a[s->top]=c;}}charpop(structstack*s){if(s->top==-1)return-1;e
larrymusk
·
2019-10-31 02:45
Remove Outermost
Parentheses
1.题目链接:https://leetcode.com/problems/remove-outermost-
parentheses
/submissions/Avalidparenthesesstringiseitherempty
守住这块热土
·
2019-10-30 12:54
LeetCode算法题-20. 有效的括号(Swift)
来源:力扣(LeetCode)链接:https://leetcode-cn.com/problems/valid-
parentheses
给定一个只包括'(',')','{','}','[',']'的字符串
entre_los_dos
·
2019-10-29 09:59
LeetCode算法题-32. 最长有效括号(Swift)
来源:力扣(LeetCode)链接:https://leetcode-cn.com/problems/longest-valid-
parentheses
著作权归领扣网络所有。
entre_los_dos
·
2019-10-24 16:04
Valid
Parentheses
思路一:有效的括号其实就是包括了三种类型:第一种,每个括号的左括号和右括号相邻,比如{}[]();第二种,对称型的,左边的括号和右边的括号的位置对称,比如:([{}]);第三种就是前两种类型的组合。那么可以发现,对于第二种类型来说,只要重复把最中间的左括号和右括号删除的操作,一个有效的括号字符串最终就会为空。比如,([{}])-->删除大括号-->([])-->删除中括号-->()-->删除小括号
xbc121
·
2019-10-24 10:00
Generate
Parentheses
产生各种合法的括号组合。比如(()())(),((()))DFSrecursion.括号是成对的,所以dfs函数有两个分支,一个加(,一个加)。classSolution:defgenerateParenthesis(self,n:int)->List[str]:result=[]ifn>0:self.dfs(n,n,"",result)returnresultdefdfs(self,l_avai
向标杆直跑
·
2019-10-24 09:16
算法题
Valid
Parentheses
有效的括号。题意是给一个input,请判断他是否是一组有效的括号。例子,Example1:Input:"()"Output:trueExample2:Input:"()[]{}"Output:trueExample3:Input:"(]"Output:falseExample4:Input:"([)]"Output:falseExample5:Input:"{[]}"Output:true思路是用
朝鲜冷面杀手
·
2019-10-11 01:00
【每天一题】LeetCode 0020. 有效的括号
开源地址:https://github.com/jiauzhang/algorithms题目/**https://leetcode-cn.com/problems/valid-
parentheses
*给定一个只包括
机器感知
·
2019-10-09 18:00
Valid
Parentheses
Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Aninputstringisvalidif:Openbracketsmustbeclosedbythesametypeofbrackets.Openbracketsmustbeclosedintheco
琴影
·
2019-09-19 22:00
Generate
Parentheses
Givennpairsofparentheses,writeafunctiontogenerateallcombinationsofwell-formedparentheses.Forexample,givenn=3,asolutionsetis:["((()))","(()())","(())()","()(())","()()()"]思路一:对于给定的n,有效的括号串长度为2n,我们可以遍历所
琴影
·
2019-09-17 21:00
Reverse Substrings Between Each Pair of
Parentheses
题目如下:GivenastringsthatconsistsoflowercaseEnglishlettersandbrackets.Reversethestringsineachpairofmatchingparentheses,startingfromtheinnermostone.Yourresultshouldnotcontainanybracket.Example1:Input:s="(
seyjs
·
2019-09-17 10:00
PEMDAS 操作順序
它以PEMDAS這幾個簡單的英文字開頭表明:P(
Parentheses
)括號。表達式中有括號,則優先計算。例如:2*(2+2)是8E(Exponentiation)指數,乘方。
太川
·
2019-08-20 14:00
Leetcode-栈&队列
20.有效的括号https://leetcode-cn.com/problems/valid-
parentheses
/给定一个只包括'(',')','{','}','[',']'的字符串,判断字符串是否有效
王朝君BITer
·
2019-08-13 23:00
VIM配置python编程环境
、目录树导航(nerdtree)、状态栏美化(vim-powerline)、主题风格(solarized)、python相关(jedi-vim和python-mode)、括号匹配高亮(rainbow_
parentheses
SugeonYen
·
2019-08-08 17:02
LeetCode 20:有效的括号 Valid
Parentheses
给定一个只包括'(',')','{','}','[',']'的字符串,判断字符串是否有效。Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.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。Aninputstringisva
爱写Bug
·
2019-08-02 10:00
Longest Valid
Parentheses
题目c++解题思路,先用栈,模拟一下括号匹配,然后维护一个数字,能够进行括号匹配的都标上1最后计算一下最长连续的1的区间长度就可以了。classSolution{public:inta[100005];charstack[100005];intstack2[100005];intpos=0;intlongestValidParentheses(strings){for(inti=0;i
Shendu.CC
·
2019-07-22 14:00
LeetCode--- Baseball Game、Backspace String Compare、Remove Outermost
Parentheses
、1047
682.BaseballGameYou'renowabaseballgamepointrecorder.Givenalistofstrings,eachstringcanbeoneofthe4followingtypes:Integer(oneround'sscore):Directlyrepresentsthenumberofpointsyougetinthisround."+"(oneroun
slbyzdgz
·
2019-07-20 21:48
刷题练习
Stack
LeetCode 22 Generate
Parentheses
题目classSolution{public:ints[10005];vectorres;vectorgenerateParenthesis(intn){if(n==0)returnres;fun("",0,0,0,0,n);returnres;}voidfun(stringstr,intleft,intright,intpos,intindex,intn){if(index==n*2){res.
Shendu.CC
·
2019-07-03 10:00
LeetCode 20 Valid
Parentheses
题目classSolution{public:chara[10005];intpos=0;;boolisValid(strings){if(s.length()==0)returntrue;for(inti=0;i
Shendu.CC
·
2019-07-02 17:00
Generate
Parentheses
LeetCode:22.GenerateParenthesesGivennpairsofparentheses,writeafunctiontogenerateallcombinationsofwell-formedparentheses.假设有n对括号,求出所有形式正确的组合。例如:["((()))","(()())","(())()","()(())","()()()"]思路一:动态规划由于括
Wisimer
·
2019-06-20 16:03
LeetCode
(Hard)Remove Invalid
Parentheses
解题思路递归。提交代码:classSolution{publicListremoveInvalidParentheses(Strings){Listres=newArrayList0)break;}if(res.size()==0)res.add("");Setset=newHashSet(set);}privatevoidhelper(StringBuilderbase,intbalance,S
AXIMI
·
2019-06-15 14:16
leetcode
Generate
Parentheses
参考资料:https://www.youtube.com/watch?v=sz1qaKt0KGQDFS总结:一般DFS:deffun()DFS()defDFS()if:DFS带回溯的DFS:deffun()DFS()defDFS()if:ret.append()DFSonecase.pop()#注意递归里要写成这样ifleft>0:self.DFS(ret,n,left-1,right,oneca
夜歌乘年少
·
2019-05-29 00:00
Valid
Parentheses
之Java实现
一、题目Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Aninputstringisvalidif:Openbracketsmustbeclosedbythesametypeofbrackets.Openbracketsmustbeclosedint
xiezh10
·
2019-05-27 00:33
LeetCode
Java
Valid
Parentheses
编程题
Remove Outermost
Parentheses
1021.RemoveOutermostParentheses(删除最外层的括号)题目: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
解家诚
·
2019-05-15 17:00
Generate
Parentheses
题目有一对圆括号"()",给定一个数字n,说明包含n对圆括号,给出所有合法的可能.Example:input:[1,0,-1,0,-2,2],0.output:[[-1,0,0,1],[-2,-1,1,2],[-2,0,0,2]]思路1递归,合法字符串一定是先有"("再有")",所以先写"(",当"("的个数大于")"时,会写")".代码简洁,也容易理解,但是很难想到啊.voidgenerateS
Jimmy木
·
2019-05-10 17:44
longest-valid-
parentheses
classSolution{public:intlongestValidParentheses(strings){intres=0,last=-1;stackst;for(inti=0;i
DaiMorph
·
2019-05-02 11:38
每天一个小程序(四)--- Valid
Parentheses
ValidParenthesesいらっしゃいませ前言:马上就要五一了呀,离下班还有一个半小时,嘿嘿嘿。。。packagestring;importjava.util.Stack;/***@authorBlackSugar*@date2019/4/16*Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determine
Autumn_bell
·
2019-04-30 16:05
学习
java小程序
java
遇到的问题
Remove Outermost
Parentheses
括号匹配想到用栈来做:classSolution:defremoveOuterParentheses(self,S:str)->str:size=len(S)ifsize==0:return""i=0strings=[]whileistr:iflen(S)==0:return""ans=[]stack=0forsinS:ifs=='('andstack>0:ans.append(s)elifs==
周洋
·
2019-04-24 07:00
Longest Valid
Parentheses
】
Givenastringcontainingjustthecharacters '(' and ')',findthelengthofthelongestvalid(well-formed)parenthesessubstring.Example1:Input:"(()"Output:2Explanation:Thelongestvalidparenthesessubstringis"()"Exa
肖冬禹想要拿OFFER
·
2019-04-09 06:31
LeetCode重点题
Remove Outermost
Parentheses
Avalidparenthesesstringiseitherempty(""),"("+A+")",orA+B,whereAandBarevalidparenthesesstrings,and+representsstringconcatenation.Forexample,"","()","(())()",and"(()(()))"areallvalidparenthesesstrings.A
Simple_R
·
2019-04-07 13:40
LeedCode365
算法和数据结构
Score of
Parentheses
括号的分数
GivenabalancedparenthesesstringS,computethescoreofthestringbasedonthefollowingrule:()hasscore1ABhasscoreA+B,whereAandBarebalancedparenthesesstrings.(A)hasscore2*A,whereAisabalancedparenthesesstring.Ex
Grandyang
·
2019-03-31 23:00
Valid
Parentheses
【Description】Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Aninputstringisvalidif:Openbracketsmustbeclosedbythesametypeofbrackets.Openbracketsmustbe
Chiduru
·
2019-03-25 17:11
Valid
Parentheses
解题报告(Python)
题目分析:这一题是匹配括号的问题,用栈去匹配可以解决。代码说明:1、这如果res里有元素且和下一个括号匹配,那就删除res最后一位,res是栈,i是res的长度。ifi>0andc==')'andres[i-1]=='(':res=res[:i-1]i-=12、其他情况入栈,同时标记栈长度加一。else:res+=ci+=13、returnres==''栈为空就是匹配成功,否则不成功。测试代码:c
Jiale685
·
2019-03-01 22:36
python
LeetCode
LeetCode题目记录
Longest Valid
Parentheses
Givenastringcontainingjustthecharacters'('and')',findthelengthofthelongestvalid(well-formed)parenthesessubstring.Example1:Input:"(()"Output:2Explanation:Thelongestvalidparenthesessubstringis"()"Exampl
dreamjay1997
·
2019-02-13 12:37
思维
Different Ways to Add
Parentheses
/279. Perfect Squares - Mark
241.DifferentWaystoAddParentheses题目描述给定一个含有数字和运算符的字符串,为表达式添加括号,改变其运算优先级以求出不同的结果。你需要给出所有可能的组合的结果。有效的运算符号包含+,-以及*。例子示例1:输入:“2-1-1”输出:[0,2]解释:((2-1)-1)=0(2-(1-1))=2示例2:输入:“23-45”输出:[-34,-14,-10,-10,10]解释
libh
·
2019-01-13 16:50
Leetcode
Score of
Parentheses
题目GivenabalancedparenthesesstringS,computethescoreofthestringbasedonthefollowingrule:()hasscore1ABhasscoreA+B,whereAandBarebalancedparenthesesstrings.(A)hasscore2*A,whereAisabalancedparenthesesstring.
liuqinh2s
·
2019-01-10 00:00
算法
leetcode
leetcode 020 有效的括号(Valid
Parentheses
) python3
所有Leetcode题目不定期汇总在Github,欢迎大家批评指正,讨论交流。'''Givenastringcontainingjustthecharacters'(',')','{','}','['and']',determineiftheinputstringisvalid.Aninputstringisvalidif:Openbracketsmustbeclosedbythesametype
OnlyChristmas
·
2019-01-04 17:58
【leetcode】
刷题总结
&
编程心得
Minimum Add to Make
Parentheses
Valid
921.MinimumAddtoMakeParenthesesValidGivenastringSof'('and')'
parentheses
,weaddtheminimumnumberofparentheses
liuqinh2s
·
2018-12-18 00:00
栈
算法
leetcode
Generate
Parentheses
题目:Givennpairsofparentheses,writeafunctiontogenerateallcombinationsofwell-formedparentheses.Forexample,givenn=3,asolutionsetis:Givennpairsofparentheses,writeafunctiontogenerateallcombinationsofwell-fo
chenghaoy
·
2018-12-12 11:19
leetcode
Generate
Parentheses
题目C++solutionclassSolution{public:vectorgenerateParenthesis(intn){vectorresult;if(n==0){result.push_back("");}else{for(inti=0;ileft=generateParenthesis(i);vectorright=generateParenthesis(n-1-i);for(in
For_course
·
2018-12-04 23:35
算法分析与设计
LeetCode | 有效的括号
文章来源:https://leetcode-cn.com/problems/valid-
parentheses
/description/给定一个只包括'(',')','{','}','[',']'的字符串
Errorong
·
2018-11-14 15:18
LeetCode
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