Problem:
Partition

Quick sort is based on the Divide-and-conquer approach. In QuickSort(A, p, r), first, a procedure Partition(A, p, r) divides an array A[p..r] into two subarrays A[p..q-1] and A[q+1..r] such that each element of A[p..q-1] is less than or equal to A[q], which is, inturn, less than or equal to each element of A[q+1..r]. It also computes the index q.

In the conquer processes, the two subarrays A[p..q-1] and A[q+1..r] are sorted by recursive calls of QuickSort(A, p, q-1) and QuickSort(A, q+1, r).

Your task is to read a sequence A and perform the Partition based on the following pseudocode:

Partition(A, p, r)
1 x = A[r]
2 i = p-1
3 for j = p to r-1
4 do if A[j] <= x
5 then i = i+1
6 exchange A[i] and A[j]
7 exchange A[i+1] and A[r]
8 return i+1

Note that, in this algorithm, Partition always selects an element A[r] as a pivot element around which to partition the array A[p..r].

Input

The first line of the input includes an integer n, the number of elements in the sequence A.

In the second line, Ai (i = 1,2,...,n), elements of the sequence are given separated by space characters.

Output

Print the sorted sequence. Two contiguous elements of the sequence should be separated by a space character. The element which is selected as the pivot of the partition should be indicated by [  ].

Constraints

1 ≤ n ≤ 100,000

0 ≤ Ai ≤ 100,000

Sample Input 1

12
13 19 9 5 12 8 7 4 21 2 6 11

Sample Output 1

9 5 8 7 4 2 6 [11] 21 13 19 12

Solution in C (judge verdict: Accepted)

#include <stdio.h>
#define N 1000001

int Partition(int, int );
int A[N];

int main(void){
int i,n,y;
 
 scanf("%d",&n);

 for(i=1;i<=n;i++){
   scanf("%d",&A[i]);
 }
 
 y=Partition(1,(n));
 
 for(i=1;i<n;i++){

   if (i==y){
     printf("[%d] ",A[i]);
   }
   else printf("%d ",A[i]);
 }
 
 printf("%d\n",A[n]);
 
 return 0;
 
}

int Partition(int p, int r){
  int i, j, x, k;
  
  x=A[r];
  i=p-1;
  for(j=p;j<=r-1;j++){

    if(A[j]<=x){
      i++;      
      k=A[i];
      A[i]=A[j];
      A[j]=k; 
    }

  }
  k=A[i+1];
  A[i + 1] = A[r];
  A[r]=k;
  return i+1;
  
}