msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
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add q316

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pull/6/head
yuanguangxin 4 years ago
parent 75f95ee6c5
commit 797687e5d6
3 changed files with 62 additions and 22 deletions
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55
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1
README.md
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@ -56,6 +56,7 @@
* [q20_有效的括号](/src/栈相关/q20_有效的括号)
* [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)
### 堆相关

28
src/栈相关/q316_去除重复字母/Solution.java
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@ -0,0 +1,28 @@
package 栈相关.q316_去除重复字母;
import java.util.Stack;
/**
* 栈操作 o(n*log(n))
*/
public class Solution {
public String removeDuplicateLetters(String s) {
Stack<Character> stack = new Stack<>();
for (int i = 0; i < s.length(); i++) {
Character c = s.charAt(i);
if (stack.contains(c)) {
continue;
}
while (!stack.isEmpty() && stack.peek() > c && s.indexOf(stack.peek(), i) != -1) {
stack.pop();
}
stack.push(c);
}
String rs = "";
for (int i = 0; i < stack.size(); i++) {
rs += stack.get(i);
}
return rs;
}
}
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