[백준 4949] 균형잡힌 세상

문제

https://www.acmicpc.net/problem/4949

4949번: 균형잡힌 세상

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내가 작성한 코드

import java.io.*;
import java.util.Stack;

public class qor4949 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        while(true){
            String input = br.readLine();

            if(input.equals(".")){
                break;
            }

            Stack<Character> st = new Stack<>();
            boolean state = true;
            String result = "";

            for(int i = 0; i<input.length(); i++){
                char word = input.charAt(i);

                if(word == '(' || word == '['){
                    st.push(word);
                }
                else if(word == ')'){
                    if(st.empty() || st.peek() != '('){
                        result += "no";
                        break;
                    }
                    else{
                        st.pop();
                    }
                }
                else if(word == ']'){
                    if(st.empty() || st.peek() != '['){
                        result += "no";
                        break;
                    }
                    else{
                        st.pop();
                    }
                }
            }

            if(result.equals("no")){
                bw.write("no");
            } else if (st.isEmpty()) {
                bw.write("yes");
            }
            else{
                bw.write("no");
            }

            bw.newLine();
        }

        bw.close();
    }
}