ModAdd

#include <algorithm>
#include <iostream>
#include <sstream>
#include <cstring>
int main(int argc, char **argv)
{
	using namespace std;
	ios::sync_with_stdio(0);
	string a, b;
	cin >> a;
	cin >> b;
	long len, sel, j;
	if (a.length() > b.length()){
		sel = 1;
		len = a.length();
		j = b.length()-1;
	} else {
		sel = 2;
		len = b.length();
		j = a.length()-1;
	}
	
//	cout << (int)a[1] - 48;
	
	long tempres;
	string finalres;
	ostringstream convert;
	for (long i = len - 1; i >= 0; i--)
	{
		if(sel == 1){
			if(j >= 0){
				tempres = ((long)a[i] - 48) + ((long)b[j] - 48);
//				cout << 'A' << (int)a[i] - 48 << endl;
				j--;
			} else {
				tempres = (long)a[i] - 48;
//				cout << 'B' <<(int)a[i] - 48 << endl;
			}
		} 
		else{
			if(j >= 0){
				tempres = ((long)a[j] -48) + ((long)b[i] - 48);
				j--;
			} else {
				tempres = (long)b[i] - 48;
			}
		}
		
		
		tempres = tempres % 10;
//		cout << tempres << ' ';
		convert << tempres;
	}
	finalres = convert.str();
	
	std::reverse(finalres.begin(), finalres.end());
	bool canDo = true;
	long p = 0;
	do{
		if(finalres[p] == '0'){
			finalres.erase (p,1);
		} else {
			canDo = false;
		}
	}while(canDo);
	cout << finalres;
}

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: TIME LIMIT EXCEEDED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED