Envío 2689

Código

#include<bits/stdc++.h>
using namespace std;

int main(){
    string num1,num2;
    cin >> num1 >> num2;
    reverse(num1.begin(),num1.end());
    reverse(num2.begin(),num2.end());
    string ans = "";
    int car = 0;
    int upTo = max(num1.size(),num2.size());
    for(int i = 0; i < upTo;++i){
        int val = car;
        if(i < num1.size()) val += num1[i] -'0';
        if(i < num2.size()) val += num2[i] -'0';
        ans += (val%10)+'0';
        car = val / 10;
    }
    if(car) ans += (car+'0');
    reverse(ans.begin(),ans.end());
    cout << ans << "\n";
}