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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<cstdio>
#include<utility>
#include<algorithm>
using namespace std;
int n,ans[251000];
pair<int,int> e[510];
int main(){
	scanf("%d",&n);
	for (int i=1;i<=n;i++){
		scanf("%d",&e[i].first); e[i].second=i;
		ans[e[i].first]=i;
	}
	sort(e+1,e+n+1);
	int l=1,r=n*n;
	for (int i=1;i<=n;i++)
		for (int j=1;j<e[i].second;j++){
			while (ans[l]) l++;
			if (l>=e[i].first){
				puts("No");
				return 0;
			}
			ans[l++]=e[i].second;
		}
	for (int i=n;i>=1;i--)
		for (int j=e[i].second+1;j<=n;j++){
			while (ans[r]) r--;
			if (r<=e[i].first){
				puts("No");
				return 0;
			}
			ans[r--]=e[i].second;
		}
	puts("Yes");
	for (int i=1;i<n*n;i++) printf("%d ",ans[i]);
	printf("%d\n",ans[n*n]);
	return 0;
}