Envío 3219

Código

//
#include <bits/stdc++.h>
using namespace std;
#define INF 1000000000
#define MOD 1000000007
#define PI 3.14159265
#define EPS 1e-9
#define Pi acos(-1.0)
typedef pair<int, int> ii;
typedef long long ll;
typedef vector<ll> vll;
typedef pair<ll,ll> pll;
#define forr(i,a,b) for(int i=(a); i<(b); i++)
#define clean(arr,val) memset(arr,val,sizeof(arr))
#define forn(i,n) forr(i,0,n)
#define PB push_back
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vpll;

/*CODE START HERE*/

string number, k;
int temp, carry;

int main(){
    ios::sync_with_stdio(0);
    cin >> number;
    cin >> k;
    // cout << "BACK\n";
    // cout << number.back() << "\n";
    
    if(k.size() > number.size()) swap(number,k);

    while(k.size() < number.size()){
        k.push_back('0');
        for(int i = (int)k.size()-1; i > 0; i--){
            k[i] = k[i-1];
        }
        k[0] = '0';
    }

    carry = 0;
    for(int i = (int)number.size()-1; i >= 0; i--){
        temp = (number[i]-'0')+(k[i]-'0')+carry;
        // cout << "TEMP " << temp << "\n";
        if(temp > 9){
            number[i] = (temp%10)+'0';
            carry = 1;
            if(i == 0){
                number.push_back('0');
                for(int i = (int)number.size()-1; i > 0; i--){
                    number[i] = number[i-1];
                }
                number[0] = '1';
            }
            continue;
        }
        number[i] = temp+'0';
        carry = 0;
    }
    cout << number << "\n";
    return 0;
}