백준 1541번 (silver 2)

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

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

int main() {
	string mathExpression;
	cin >> mathExpression;
	std::vector<string> v;

	int offset = 0;
	while (true) {
		int size = mathExpression.find('-', offset);
		if (size == string::npos) {
			v.push_back(mathExpression.substr(offset));
			break;
		}
		
		v.push_back(mathExpression.substr(offset, size - offset));
		offset = size + 1;

	}

	vector<int> v1;
	int size = v.size();
	for (int i = 0; i < size; ++i) {
		int tmp = 1;
		int sum = 0;
		for (int j = v[i].size() - 1; j >= 0; --j) {
			if (v[i][j] - '0' > 9 || v[i][j] - '0' < 0) {
				tmp = 1;
				continue;
			}
			sum += (v[i][j] - '0') * tmp;
			tmp *= 10;
		}
		v1.push_back(sum);
	}
	int sum = v1[0] * 2;
	for (auto& it : v1) {
		sum -= it;
	}
	cout << sum;
	return 0;
}