AtCoder Beginner Contest 349
G
Palindrome Construction
AtCoder
⌀ 2655
原题
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Problem Statement

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A sequence of positive integers $T=(T_1,T_2,\dots,T_M)$ of length $M$ is a palindrome if and only if $T_i=T_{M-i+1}$ for each $i=1,2,\dots,M$.

翻译中…

You are given a sequence of non-negative integers $A = (A_1,A_2,\dots,A_N)$ of length $N$. Determine if there is a sequence of positive integers $S=(S_1,S_2,\dots,S_N)$ of length $N$ that satisfies the following condition, and if it exists, find the lexicographically smallest such sequence.

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  • For each $i=1,2,\dots,N$, both of the following hold:
  • The sequence $(S_{i-A_i},S_{i-A_i+1},\dots,S_{i+A_i})$ is a palindrome.
    • If $2 \leq i-A_i$ and $i+A_i \leq N-1$, the sequence $(S_{i-A_i-1},S_{i-A_i},\dots,S_{i+A_i+1})$ is not a palindrome.
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Constraints

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  • $1 \leq N \leq 2 \times 10^5$
  • $0 \leq A_i \leq \min\{i-1,N-i\}$
  • All input values are integers.
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Input

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

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N
A_1 A_2 \dots A_N

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Output

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If there is no sequence $S$ that satisfies the condition, print No.

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If there is a sequence $S$ that satisfies the condition, let $S'$ be the lexicographically smallest such sequence and print it in the following format:

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Yes
S'_1 S'_2 \dots S'_N

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样例

Input #1
7
0 0 2 0 2 0 0
Output #1
Yes
1 1 2 1 1 1 2
$S = (1,1,2,1,1,1,2)$ satisfies the condition: - $i=1$: $(A_1)=(1)$ is a palindrome. - $i=2$: $(A_2)=(1)$ is a palindrome, but $(A_1,A_2,A_3)=(1,1,2)$ is not. - $i=3$: $(A_1,A_2,\dots,A_5)=(1,1,2,1,1)$ is a palindrome. - $i=4$: $(A_4)=(1)$ is a palindrome, but $(A_3,A_4,A_5)=(2,1,1)$ is not. - $i=5$: $(A_3,A_4,\dots,A_7)=(2,1,1,1,2)$ is a palindrome. - $i=6$: $(A_6)=(1)$ is a palindrome, but $(A_5,A_6,A_7)=(1,1,2)$ is not. - $i=7$: $(A_7)=(2)$ is a palindrome. There are other sequences like $S=(2,2,1,2,2,2,1)$ that satisfy the condition, but print the lexicographically smallest one, which is $(1,1,2,1,1,1,2)$.
Input #2
7
0 1 2 3 2 1 0
Output #2
Yes
1 1 1 1 1 1 1
Input #3
7
0 1 2 0 2 1 0
Output #3
No
题目信息
题号
abc349_g
时间限制
2 s
内存限制
1024 MB

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