[BOJ] 백준 1541 잃어버린 괄호

[문제]

https://www.acmicpc.net/problem/1541

 

 

[소스 코드]

import java.io.*;
import java.util.*;
public class Main {
    public static void main(String[] args) throws IOException {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    	String s = br.readLine();
    	int num = 0;
		int sign = 1;
		int result = 0;
    	for(int i=0;i<s.length();i++) {
    		char c = s.charAt(i);
    		if(c=='+' || c=='-') {
    			result += num*sign;
    			if(c=='-') sign = -1;
    			num = 0;
    		}
    		else {
    			num *= 10;
    			num += c - '0';
    		}
    	}
    	result += num * sign;
    	System.out.println(result);
    }
}