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<algorithm>
using namespace std;
int n,tot,now,x[510],b[510],a[250010];
bool cmp(int a,int b){
	return x[a]<x[b];
}
int main(){
	scanf("%d",&n);
	for(int i=1;i<=n;i++){
		scanf("%d",x+i);
		if(a[x[i]]){
			puts("No");
			return 0;
		}
		a[x[i]]=i;
		b[++tot]=i;
	}
	sort(b+1,b+n+1,cmp);
	now=1;
	for(int k=1;k<=n;k++){
		int i=b[k],cnt=i-1;
		while(cnt&&now<x[i]){
			if(!a[now]){
				cnt--;
				a[now]=i;
			}
			now++;
		}
		if(cnt){
			puts("No");
			return 0;
		}
	}
	int now=n*n;
	for(int k=n;k;k--){
		int i=b[k],cnt=n-i;
		while(cnt&&now>x[i]){
			if(!a[now]){
				cnt--;
				a[now]=i;
			}
			now--;
		}
		if(cnt){
			puts("No");
			return 0;
		}
	}
	puts("Yes");
	for(int i=1;i<=n*n;i++)
		printf("%d ",a[i]);
	return 0;
}