ModAdd

#include <iostream>
#include <string>
#include <limits.h>


int main(int argc, const char * argv[]) {
    
    std::string num1, num2;
    std::cin >> num1 >> num2;
 
    unsigned long n1_len = num1.length();
    unsigned long n2_len = num2.length();
    

    if(n1_len > n2_len){
        num2 = std::string(n1_len - n2_len, '0') + num2;
    } else if(n1_len < n2_len){
        num1 = std::string(n2_len - n1_len, '0') + num1;
    }
    
    //std::cout << num1 << "\n";
    //std::cout << num2 << "\n";
    
    unsigned long lmax = std::max(n1_len, n2_len);
    
    char* buff = (char*)malloc(lmax * sizeof(char));
    
    for(unsigned long i = 0; i < lmax; i++){
        int res = (int)num1[i] + (int)num2[i] - 96;
        buff[i] = (res % 10) + 48;
    }
    
    unsigned long i = 0;
    for(; i < lmax; i++){
        if(buff[i] != '0')
            break;
    }
    
    //std::cout << i << "\n";
    
    if(i == lmax){
        std::cout << 0 << "\n";
        return 0;
    }
    
    buff = buff + i;
    
    std::cout << buff << "\n";
    
    
    return 0;
    
}

//986127880802649345005075311357195618317413704635453838566074615442041419233602647325426490887465537867
//986127880802649345005075311357195618317413704635453838566074615442041419233602647325426490887465537867

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED