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DuplicateBrackets.java
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45 lines (36 loc) · 1.24 KB
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// 1. You are given a string exp representing an expression.
// 2. Assume that the expression is balanced i.e. the opening and closing brackets match with each other.
// 3. But, some of the pair of brackets maybe extra/needless.
// 4. You are required to print true if you detect extra brackets and false otherwise.
// e.g.'
// ((a + b) + (c + d)) -> false
// (a + b) + ((c + d)) -> true
import java.io.*;
import java.util.*;
public class DuplicateBrackets {
public static boolean check(String str){
Stack<Character> st = new Stack<>();
for(int i=0;i<str.length();i++){
char ch = str.charAt(i);
if(ch==')'){
if(st.peek()=='('){
return true;
}else{
while(st.size()>0 && st.peek()!='('){
st.pop();
}
st.pop();
}
}else{
st.push(ch);
}
// System.out.println(st);
}
return false;
}
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
System.out.println(check(str));
}
}