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Copy pathBracket.java
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66 lines (58 loc) · 1.78 KB
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package quiz;
import com.sun.tools.doclets.formats.html.SourceToHTMLConverter;
import java.util.*;
/**
* @Author : yion
* @Date : 2017. 6. 16.
* @Description : 지정된 괄호들의 밸런스가 맞는지 검증
*/
public class Bracket {
public static void main(String[] args) {
/*
3
{[()]}
{[(])}
{{[[(())]]}}
*/
Scanner in = new Scanner(System.in);
int t = in.nextInt();
for (int a0 = 0; a0 < t; a0++) {
String expression = in.next();
System.out.println( (isBalanced(expression)) ? "YES" : "NO" );
}
}
public static boolean isBalanced(String expression) {
Stack<String> stack = new Stack<>();
for (int i =0 ; i < expression.length(); i++) {
String ch = expression.substring(i, i + 1);
if (ch.equals("[") || ch.equals("{") || ch.equals("(")) {
stack.push(ch);
} else {
if (ch.equals(")")) {
if (stack.empty()) {
return false;
}
if (stack.peek().equals("(")) {
stack.pop();
}
} else if (ch.equals("}")) {
if (stack.empty()) {
return false;
}
if (stack.peek().equals("{")) {
stack.pop();
}
} else if (ch.equals("]")) {
if (stack.empty()) {
return false;
}
if (stack.peek().equals("[")) {
stack.pop();
}
}
}
}
//stack.forEach((str) -> System.out.println(str));
return stack.empty();
}
}