Help in the code (BUGCAL)

general
,
1

What’s wrong with my solution for BUGCAL?

This also satisfies the constraints!
Any help would be appreciated! Thanks in advance!

2

Your code is failing for this test case :

1

515 515

Your O/P : 020 (WA)
Correct O/P : 20

Here is your AC code :stuck_out_tongue:

    #include <iostream>
#include <bits/stdc++.h>
#include <string> 
 
using namespace std;
 
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	int T;
	cin>>T;
	while(T--)
	{
	    long long a,b;
	    cin>>a>>b;
	    string str;
	    while(a>0||b>0)
	    {
	        str+=to_string((a%10+b%10)%10);
	        a/=10;
	        b/=10;
	    }
	    reverse(str.begin(),str.end());
	    long long i;
	    int flag=1;
	    for(i=0;i<str.length();i++)
	    {
	        if(str[i]!='0')
	        {
	            flag=0;
	            break;
	        }
	    }
	    if(flag==1)
	        cout << "0" << endl;
	    else 
	        cout <<str.substr(i) << endl;
	}
	return 0;
}
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