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Merge pull request MisterBooo#107 from ztianming/patch-2

Update LeetCode第20号问题:有效的括号.md

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notes
- LeetCode第20号问题:有效的括号.md

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`‎notes/LeetCode第20号问题:有效的括号.md‎`

Lines changed: 49 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -71,7 +71,8 @@`
`71`	`71`
`72`	`72`	`### 代码实现`
`73`	`73`
`74`		-```
	`74`	`+#### C++`
	`75`	+```c++
`75`	`76`	`class Solution {`
`76`	`77`	`public:`
`77`	`78`	`bool isValid(string s) {`
`@@ -109,7 +110,52 @@ public:`
`109`	`110`	`}`
`110`	`111`	`};`
`111`	`112`	```
	`113`	`+#### Java`
	`114`	+```java
	`115`	`+class Solution {`
	`116`	`+ public boolean isValid(String s) {`
	`117`	`+ //String open="({[";`
	`118`	`+ //String close="]})";`
	`119`	`+`
	`120`	`+ Stack<Character> stack = new Stack<Character>();`
	`121`	`+`
	`122`	`+ if(s.length() % 2 != 0)`
	`123`	`+ return false;`
	`124`	`+`
	`125`	`+`
	`126`	`+ for (char c : s.toCharArray())`
	`127`	`+ {`
	`128`	`+ if (c == '(') stack.push(')');`
	`129`	`+ else if (c == '{') stack.push('}');`
	`130`	`+ else if (c == '[') stack.push(']');`
	`131`	`+ else if (stack.isEmpty() \|\| stack.pop() != c) return false;`
	`132`	`+ }`
	`133`	`+`
	`134`	`+ return stack.isEmpty();`
	`135`	`+ }`
	`136`	`+`
	`137`	`+}`
	`138`	+```
	`139`	`+#### Python`
	`140`	+```python
	`141`	`+class Solution(object):`
	`142`	`+ def isValid(self, s):`
	`143`	`+ open_list = ["[", "{", "("]`
	`144`	`+ close_list = ["]", "}", ")"]`
	`145`	`+ stack = []`
	`146`	`+`
	`147`	`+ for i in s:`
	`148`	`+ if i in open_list:`
	`149`	`+ stack.append(i)`
	`150`	`+ elif i in close_list:`
	`151`	`+ pos=close_list.index(i)`
	`152`	`+ if len(stack)>0 and (open_list[pos] == stack[len(stack)-1]):`
	`153`	`+ stack.pop()`
	`154`	`+ else:`
	`155`	`+ return False`
	`156`	`+ if len(stack) == 0:`
	`157`	`+ return True`
	`158`	+```
`112`	`159`
`113`	`160`
`114`		`-`
`115`		`-![](https://blog-1257126549.cos.ap-guangzhou.myqcloud.com/blog/gkcza.png)`
	`161`	`+![](https://blog-1257126549.cos.ap-guangzhou.myqcloud.com/blog/gkcza.png)`

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