[백준 1541: 잃어버린 괄호] - C++

www.acmicpc.net/problem/1541

1541번: 잃어버린 괄호

#include<iostream>
#include<string>
using namespace std;

int main() {
	int num = 0;
	string n;
	string temp;

	bool change = false;
	cin >> n;
	for (int i = 0; i <= n.size(); ++i) {
		if (n[i] == '+' || n[i] == '-' || n[i] == '\0') {
			if (change) {
				num -= stoi(temp);
			}
			else {
				num += stoi(temp);
			}

			if (n[i] == '-') {
				change = true;
			}

			temp = "";
			continue;
		}

		temp += n[i];
	}


	cout << num << endl;
	return 0;
}