Please help in question NCOPIES

1

#include <bits/stdc++.h>

using namespace std;

int main()
{
int t;
cin>>t;
while(t–)
{
int n,m;
cin>>n>>m;
string s;
cin>>s;
int count=0;
for(int j=0;j<n;j++)
{
if(s[j]==‘1’)
count++;
}

  long long int ans=n*m;
  if(count==0)
  cout<<ans<<'\n';
  else if(count%2!=0 && m%2!=0)
  cout<<"0\n";
  else
  {
    int temp1=0,temp2=0;
    vector<int> v;
  for(int j=0;j<n;j++)
  {
    if(s[j]=='1')
    {
      v.push_back(j);
    }
  }
  
    for(int j=0;j<n;j++)
    {
      if(s[j]=='1')
      {
        temp1=j;
        break;
      }
    }
    
    for(int j=n-1;j>=0;j--)
    {
      if(s[j]=='1')
      {
        temp2=n-1-j;
        break;
      }
    }
    
    if(m%2==0)
    {
      cout<<temp2+temp1+1<<'\n';
    }
    else 
    {
      cout<< v[count/2]-v[count/2 - 1] <<'\n';
    }
  }
}
return 0;

}

can anyone tell anyone test case where this code fails