P55982: F006A. Sabeu sumar?

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


string suma(string x, string y) {
    int tam_x = x.size();
    int tam_y = y.size();
    string z(tam_x + 1, '0');
    int carry = 0;
    for (int i = 0; i < tam_x; ++i) {
        int val = carry + x[tam_x - i - 1] - '0';
        if (i < tam_y) val += y[tam_y - i - 1] - '0';
        z[tam_x - i] = val%10 + '0';
        carry = val/10;
    }
    z[0] += carry;
    return z;
}


int main() {
    string x, y;
    while (cin >> x >> y) cout << suma(x,y) << endl;
}

//JosepRivaille