What is wrong in my code

help
,
1

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

int main() {
// your code goes here
int t;
cin>>t;
while(t–){
int n;
int m;

    cin>>n>>m;
    string s,k;
    cin>>s>>k;
    

   
   int minOps=1e9;
   
   for(int i=0;i<=n-m;i++){
        
        int ans=0;
        int x=0;
       for(int j=i;j<i+m;j++){
           int num1=k[x]-'0';
           int num2=s[j]-'0';
           ans+=min(abs(num1-num2),abs(10-num2+num1));
           x++;
       }
       minOps=min(ans,minOps);
   }
   cout<<minOps<<endl;
}

return 0;

}