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53 lines (46 loc) · 1.42 KB
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Balanced_Brackets_Stack
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53 lines (46 loc) · 1.42 KB
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import java.io.*;
import java.util.*;
public class Main {
public static void main(String[] args) throws Exception {
Scanner scn = new Scanner(System.in);
String str = scn.nextLine();
System.out.println(bb(str));
}
public static boolean bb(String str){
Stack<Character> st = new Stack<>();
for(int i = 0;i < str.length(); i++){
char ch = str.charAt(i);
if(ch == '(' || ch == '{' || ch == '['){
st.push(ch);
}
else if(ch == ')' || ch == '}' || ch == ']'){
if(st.size() == 0){
return false; // more closing brackets
}
if(ch == ')'){
if(st.peek() != '('){
return false; // mismatch
}
}
else if(ch == '}'){
if(st.peek() != '{'){
return false; // mismatch
}
}
else{
if(st.peek() != '['){
return false; // mismatch
}
}
st.pop(); // balanced out
}else{
// ignore
}
}
if(st.size() == 0){
return true;
}else{
return false; // more opening brackets
}
}
}