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p141.java
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p141.java
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import java.util.LinkedList;
import java.util.Scanner;
public class p141 {
public static void main(String[] args) {
final Scanner s = new Scanner(System.in);
boolean balanced;
LinkedList<Character> cola = new LinkedList<>();
String str;
char c;
while (s.hasNext()) {
str = s.nextLine();
balanced = true;
for (int i = 0; i < str.length() && balanced; i++) {
c = str.charAt(i);
if (c == '{' || c == '[' || c == '(') {
cola.addLast(c);
}
else if (c == ']' || c == '}' || c == ')') {
if (cola.isEmpty()) {
balanced = false;
}
else {
Character removed = cola.removeLast();
switch (c) {
case '}':
balanced = removed == '{';
break;
case ')':
balanced = removed == '(';
break;
case ']':
balanced = removed == '[';
break;
default:
balanced = false;
}
}
}
}
balanced = balanced && cola.isEmpty();
System.out.println( (balanced) ? "YES" : "NO" );
cola.clear();
}
}
}