What is wrong with my code

help
, ,
1

Problem Link : problem
solution link : solution
Any help appreciated

2

Index increment only when its having wrong answer . when there’s ‘N’ you should simply skip that. and when the last element matches you should increment or else do nothing.
**your modified code - **

#include<bits/stdc++.h>

using namespace std;

int main()
{
    int p,q,r,t,n;
    cin>>t;
    while(t)
    {
        int c=0;
        cin>>n;
         char a[n],b[n];
        cin>>a;
        cin>>b;
        for(int i=0;i<n;i++){
            if(b[i]!='N'){
                 if(a[i]==b[i] && i == n-1){
                c++;}
                
                else if(a[i]!=b[i])
                i++;
                else c++;
            }
           
        }
            cout<<c<<endl;
             t--;


    }
    return 0;
}

ps: dont depend on others as they also busy in debugging their own codes.

1 Like
3

That’s exactly what the following else if does

else if(b[i]!='N'&&a[i]!=b[i]&&i<n-2)
            i++;

This ensures increment only happens when character in a and b are not equal and b is not N.

I found the problem with my code and it had nothing to do with what you said. The problem was with for loop that went only up to n-2nd iteration starting from 0 ,which means if the n-2nd element is wrong then n-1th element(last element) won’t be skipped resulting in to wrong answer.