Problem:
Score : 800 points

Problem Statement

You are given an integer sequence x of length N.
Determine if there exists an integer sequence a that satisfies all of the following conditions, and if it exists, construct an instance of a.

a is N^2 in length, containing N copies of each of the integers 1, 2, ..., N.

For each 1 ≤ i ≤ N, the i-th occurrence of the integer i from the left in a is the x_i-th element of a from the left.

Constraints

1 ≤ N ≤ 500

1 ≤ x_i ≤ N^2

All x_i are distinct.

Input

The input is given from Standard Input in the following format:

N
x_1 x_2 ... x_N

Output

If there does not exist an integer sequence a that satisfies all the conditions, print No.
If there does exist such an sequence a, print Yes in the first line, then print an instance of a in the second line, with spaces inbetween.

Sample Input 1

3
1 5 9

Sample Output 1

Yes
1 1 1 2 2 2 3 3 3

For example, the second occurrence of the integer 2 from the left in a in the output is the fifth element of a from the left.
Similarly, the condition is satisfied for the integers 1 and 3.

Sample Input 2

2
4 1

Sample Output 2

No

Solution in Python (3.4.3) (judge verdict: Runtime Error)

import math,string,itertools,fractions,heapq,collections,re,array,bisect,sys,random,time

sys.setrecursionlimit(10**7)
inf = 10**20
mod = 10**9 + 7


def main():
    n = int(input())
    a = list(map(int, input().split()))
    nn = n*n
    r = [-1] * nn
    ms = []
    us = []
    for i in range(n):
        c = i+1
        ri = a[i] - 1
        if r[ri] > 0:
            print('No')
            return
        r[ri] = c
        ms.append([ri, i, c])
        us.append([ri, n-i-1, c])
    ms.sort()
    si = 0
    for ri, k, c in ms:
        for _ in range(k):
            while r[si] > 0 and si < nn:
                si += 1
            if si > ri or r[si] > 0:
                print('No')
                return
            r[si] = c
            si += 1

    si = nn-1
    us.sort()
    us.reverse()
    for ri, k, c in us:
        for _ in range(k):
            while r[si] > 0 and si > 0:
                si -= 1
            if si < ri or r[si] > 0:
                print('No')
                return
            r[si] = c
            si += 1

    print('Yes')
    print(' '.join(map(str, r)))


main()