[algogeeks] Please correct the error in my code

[ankit sablok]

I have debugged my program from all points of view but i cant find the
cause of a wrong answer for this problem

http://uva.onlinejudge.org/external/4/406.html

here is my source code for the problem

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<iostream>
#include<algorithm>
#include<cmath>
#include<iterator>

using namespace std;

#define pb push_back

vector<bool>prime; // this vector will hold all the primes

inline int sieve()
{
  int i,j;

  for(i = 0; i <= 1000 ; i++)
  prime.pb(true);

  for(i = 2; i*i <= 1000 ; i++)
  {
     for(j = 2 ; i*j <= prime.size() ; j++ )
     prime[i*j] = false;
  }

  return 0;

}

int main()
{
    int i,j,k;

    sieve();

    int N,C;

    while( scanf("%d %d",&N,&C) == 2)
    {

    vector<int>primes;

    primes.pb(1);

    for(i=2;i<=N;i++)
    if(prime[i])
    primes.pb(i);

    vector<int>::iterator p; // used for pointing to the vector

    printf("%d %d: ",N,C);

    if((primes.size())%2 == 0)
    {
      if(C*2 >= primes.size())
      {
        for(i=0;i<primes.size();i++)
        printf("%d ",primes[i]);
      }

      else
      {
          p=primes.begin();
          p=p+((primes.size() - (2*C))/2);

          for(i=0;i<(C*2);i++)
          printf("%d ",*(p+i));
      }
    }

    else
    {
        if((C*2 - 1) >= primes.size() )
        {
          for(i=0;i<primes.size();i++)
          printf("%d ",primes[i]);
        }

        else
        {
            p=primes.begin();
            p = p + ((primes.size() - (2*C - 1))/2);

            for(i=0;i<(2*C-1);i++)
            printf("%d ",*(p+i));
        }
    }

    printf("\n");

    }

    getchar();
    getchar();

    return 0;
}

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