Https://www.codechef.com/viewsolution/49964402

help
1 
#include <bits/stdc++.h>
using namespace std;
#define ll long long

int main() {
    int t;
    cin>>t;
    
	// your code goes here
	while(t-->0){
       ll n,k;
       cin>>n>>k;
       string s;
       cin>>s;
       vector<int> v;
       for(int i=0;i<n;i++){
           if(s[i]=='1'){
               v.push_back(i);
           }
       }
       if(v.size()==0){
           cout<<0<<endl;
           continue;
       }
       for(int i=0;i<v.size();i++){
           if(i==0){
               v[i]+=1;
           }
           else{
               if(v[i]-v[i-1]<k){
                   v[i]+=1;
               }
               else if(v[i]-v[i-1]==k+1){
                   v[i]-=1;
               }
               else if(v[i]-v[i-1]!=k){
                   v[i]+=1;
               }
           }
       }
       int cnt=1;
       for(int i=1;i<v.size();i++){
           if(v[i]-v[i-1]>k) cnt++;
       }
       cout<<cnt<<endl;
   }
  
	return 0;
}

PROBLEM: FRIENDGR Problem - CodeChef
SOLUTION: CodeChef: Practical coding for everyone
Hey, @aravind861 can you please explain how you came up with this approach?

Thank You!!