ModAdd

input/code.cpp: In function 'int main()':
input/code.cpp:13:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(a.length() != l) {
                   ^
input/code.cpp:14:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<l-a.length();i++) padded_a += "0";
                            ^
input/code.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(b.length() != l) {
                   ^
input/code.cpp:18:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<l-b.length();i++) padded_b += "0";
                            ^

#include <bits/stdc++.h>

#define ll long long
#define vi vector<int>

using namespace std;

int main() {
	string a, b;
	cin >> a >> b;
	int l = max(a.length(), b.length());
	string padded_a="", padded_b="";
	if(a.length() != l) {
		for(int i=0;i<l-a.length();i++) padded_a += "0";
	}
	padded_a += a;
	if(b.length() != l) {
		for(int i=0;i<l-b.length();i++) padded_b += "0";
	}
	padded_b += b;
	string res = "";
	bool az=true;
	for(int i=0;i<l;i++) {
		int va = padded_a[i]-'0';
		int vb = padded_b[i]-'0';
		int r = (va+vb)%10;
		res += to_string(r);
		if(r!=0) az=false;
	}
	if(az) {
	cout<<0<<endl; return 0;
	}
	int s = 0;
	while(res[s] == '0' && s<l) s++;
	for(;s<l;s++) cout << res[s];
	cout << endl;
	return 0;
}

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