msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
Code Issues Projects Releases Wiki Activity

add q32

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pull/6/head
yuanguangxin 5 years ago
parent 962f808cf9
commit f306cb3332
3 changed files with 72 additions and 46 deletions
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79
.idea/workspace.xml
Unescape View File

@ -2,8 +2,7 @@
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<configuration name="Solution (1)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="hash相关.q1_两数之和.f1.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
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<module name="LeetCode" />
@ -147,12 +133,12 @@
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@ -227,11 +213,11 @@
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<option name="localTasksCounter" value="54" />
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@ -688,7 +675,6 @@
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@ -713,7 +699,8 @@
<MESSAGE value="update Rocket.md" />
<MESSAGE value="add q945" />
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1
README.md
Unescape View File

@ -58,6 +58,7 @@
### 栈相关
* [q20_有效的括号](/src/栈相关/q20_有效的括号)
* [q32_最长有效括号](/src/栈相关/q32_最长有效括号)
* [q224_基本计算器](/src/栈相关/q224_基本计算器)
* [q316_去除重复字母](/src/栈相关/q316_去除重复字母)

38
src/栈相关/q32_最长有效括号/Solution.java
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@ -0,0 +1,38 @@
package 栈相关.q32_最长有效括号;
import java.util.Stack;
/**
* 利用索引栈 o(n)
*/
public class Solution {
public int longestValidParentheses(String s) {
if (s == null || s.length() < 2) {
return 0;
}
int maxLen = 0;
Stack<Integer> stack = new Stack<>();
stack.push(-1);
for (int i = 0; i < s.length(); i++) {
char temp = s.charAt(i);
if (temp == '(') {
stack.push(i);
} else {
stack.pop();
if (stack.empty()) {
stack.push(i);
} else {
maxLen = Math.max(maxLen, i - stack.peek());
}
}
}
return maxLen;
}
public static void main(String[] args) {
System.out.println(new Solution().longestValidParentheses(")()())"));
}
}
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