Envío 2896

Código

#include <iostream>
using namespace std;

string sum(string x, int i, string y, int j) {
    int carry = 0, sum = 0;
    for (; i >= 0; --i, --j) {
        sum = (j >= 0) ? x[i] + y[j] - 96 : x[i] - 48;
        sum += carry;
        x[i] = (sum % 10) + 48;
        carry = (sum > 9) ? 1 : 0;
    }
    if (carry == 1 || x[0] == '0')
        return '1' + x;
    else
        return x;
}

int main(void) {
    string x, y;
    cin >> x >> y;

    int i = x.length() - 1, j = y.length() - 1;
    string res = (i > j) ? sum(x, i, y, j) : sum(y, j, x, i);
    cout << res << endl;
    return (0);
}