INS14C-Digo plays with Numbers

Digo plays with Numbers

GIVEN BELOW CODE IS FOR INS14C SPOJ OR DIGO PLAY WITH NUMBER SPOJ.

#include <bits/stdc++.h>
using namespace std;
int main()
{
 int t;
 scanf("%d",&t);
 while(t--)
 {
  int n,k;
  char s[1009];
  scanf("%d%d",&n,&k);
  vector<int>one,zero;
  scanf("%s",s);
  for(int i=0;i<n;i++)
  {
   if(s[i] == 48)
    zero.push_back(i);
   else
    one.push_back(i);
  }
  int count=1,j;
  for(int i=0,j=0;count <= n-k;count++)
  {
   if(count&1){
    if(i<one.size())
     s[one[i++]] = 50;
    else
     s[zero[j++]]=50;
   }
   else{
    if(j<zero.size())
     s[zero[j++]] = 50;
    else
     s[one[i++]]=50;
   }
  }
  for(int i=0;i<n;i++)
   if(s[i]!=50)
    printf("%c",s[i]);
  printf("\n");
 }
 return 0;
}