Divisible By 8

help
,
1

It is showing wrong answer, help me solve this, please.

Question link -DIVISIBLEBY8 Problem - CodeChef

include <bits/stdc++.h>
using namespace std;

int main() {
int t;
cin>>t;
while(t–){
int n,a,b,c;
string m,o,p=“”,j=“”,s;
cin>>n>>m;
s=m;
if(n<=3){
c=stoi(m);
a=c % 8;
b=c-a;
if(b%10==0) b+=8;
cout<<b<<endl;
}
else{
o=s.substr(n-3,3);
c=stoi(o);
if(o[0]==‘0’ && o[1]==‘0’ && o[2]==‘0’) j=“000”;
else if(o[0]==‘0’ && o[1]==‘0’) j=“00”;
else if(o[0]==‘0’) j=“0”;
a=c % 8;
b=c-a;
if(b%10==0) b+=8;
p=to_string(b);
p=j+p;
s[n-3]=p[0];
s[n-2]=p[1];
s[n-1]=p[2];
cout<<s<<endl;
}

}
return 0;

}

2

@souvik_2004
Plzz refer the following solution for better understanding of the logic and implementation .

#include <bits/stdc++.h>
using namespace std;

int main() {
	int t;
	cin>>t;
	while(t--){
	    int n,v;
	    string s;
	    cin>>n>>s;
	    if(n<=3) v=stoi(s);
	    else v=stoi(s.substr(n-3));
	    if(v%8==0) cout<<s<<endl;
	    else{
	        int ans;
	        if(n==1) ans=0;
	        else if(n==2) ans=stoi(s.substr(n-2,1));
	        else ans=stoi(s.substr(n-3,2));
	        if(ans%4==0) s.back()='8';
	        else if(ans%4==1) s.back()='6';
	        else if(ans%4==2) s.back()='4';
	        else s.back()='2';
	        cout<<s<<endl;
	    }
	}
	return 0;
}
3

I asked what was wrong with my logic. You copied and pasted a random answer.

4

@souvik_2004
I have sent u the solution i came up with …To get more help plzz explain your logic and also send the code in formatted form … so that it can be easily understandable and readable.