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BalancedBrackets.java
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BalancedBrackets.java
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import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static boolean isBalanced(String expression) {
Stack s = new Stack();
for (int i = 0; i < expression.length(); ++i) {
if (expression.charAt(i) == '(' || expression.charAt(i) == '{' || expression.charAt(i) == '[')
s.push(expression.charAt(i));
else if (expression.charAt(i) == ')') {
if (s.isEmpty())
return false;
char c = (char) s.pop();
if (c != '(')
return false;
}
else if (expression.charAt(i) == ']') {
if (s.isEmpty())
return false;
char c = (char) s.pop();
if (c != '[')
return false;
}
else if (expression.charAt(i) == '}') {
if (s.isEmpty())
return false;
char c = (char) s.pop();
if (c != '{')
return false;
}
}
if (!s.isEmpty())
return false;
return true;
}
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int t = in.nextInt();
for(int a0 = 0; a0 < t; a0++) {
String expression = in.next();
boolean answer = isBalanced(expression);
if(answer)
System.out.println("YES");
else System.out.println("NO");
}
}
}