ModAdd

input/code.cpp: In function 'int main()':
input/code.cpp:35:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(a.length()<=i) {
                        ^
input/code.cpp:38:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         else if(b.length()<=i) {
                             ^

#include <bits/stdc++.h>

#define _ ios_base::sync_with_stdio(0);cin.tie();
#define ll long long
#define vi vector<int>
#define pb push_back
#define pii pair<int, int>
#define vpii vector<pii>

using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);

    string a;
    string b;
    cin >> a;
    cin >> b;

    if(a == "0") {
        cout << b << "\n";
        return 0;
    }

    if(b == "0") {
        cout << a << "\n";
        return 0;
    }

    int len = max(a.length(), b.length());

    for(int i=0;i<len;i++) {
        int sum = 0;
        if(a.length()<=i) {
            sum = b[i]-48;
        }
        else if(b.length()<=i) {
            sum = a[i]-48;
        }
        else {
            sum = (a[i]-48) + (b[i]-48);
        }
        if(sum % 10 != 0) {
            cout << sum % 10;
        }
    }

    cout << "\n";

	return 0;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER