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Is the description is not strong enough?
Here's my code. I havent inserted the duplicate inputs.

// The PlayBoy Chimp (10611)
// 20.09.06

#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>

long arr[50009];

int comp(const void *a,const void *b);

void main()
{
long key,index,i,data,n1;
long ...