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>
 
void swap(int A[], int i, int j) {
    int t;
    t = A[i];
    A[i] = A[j];
    A[j] = t;
}
 
int partition(int A[], int p, int r) {
    int x,i,j,t;
    x = A[r];
    i=p;
    for(j=p;j<r;j++) {
        if(A[j] <= x) {
            swap(A, i, j);
            i++;
        }
    }
     
    swap(A, i, r);
    return i;
}
 
int A[100000+2];
 
int main(void) {
    int n,i,t;
    scanf("%d\n", &n);
    for(i=0;i<n;i++) {
        scanf("%d", &A[i]);
    }
     
    t = partition(A, 0, n-1);
    for(i=0;i<n;i++) {
        if(t == i) {
            printf("[%d]", A[i]);
        } else {
            printf("%d", A[i]);
        }
         
        if(i<n-1) {
            printf(" ");
        } else {
            printf("\n");
        }
    }
     
    return 0;
}