3^N Minesweeper

题目描述

There is zero or one bomb at each of positions $0, 1, 2, \ldots, 3^N-1$.
Let us say that positions $x$ and $y$ are neighboring each other if and only if the following condition is satisfied for every $i=1, \ldots, N$.

Let $x'$ and $y'$ be the $i$-th lowest digits of $x$ and $y$ in ternary representation, respectively. Then, $|x' - y'| \leq 1$.

It is known that there are exactly $A_i$ bombs in total at the positions neighboring position $i$. Print a placement of bombs consistent with this information.

输入格式

The input is given from Standard Input in the following format: $N$ $A_0$ $A_1$ $\ldots$ $A_{3^N-1}$

输出格式

Print $B_0, B_1, \ldots, B_{3^N-1}$ with spaces in between, where $B_i = 0$ if position $i$ has no bomb and $B_i = 1$ if position $i$ has a bomb.

1
0 1 1

0 0 1

2
2 3 2 4 5 3 3 4 2

0 1 0 1 0 1 1 1 0

2
0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0

提示

$1 \leq N \leq 12$ There is a placement of bombs consistent with $A_0, A_1, \ldots, A_{3^N-1}$. All values in the input are integers.Position $0$ is neighboring positions $0$ and $1$, which have $0$ bombs in total.
Position $1$ is neighboring positions $0$, $1$, and $2$, which have $1$ bomb in total.
Position $2$ is neighboring positions $1$ and $2$, which have $1$ bombs in total.
If there is a bomb at only position $2$, all conditions above are satisfied, so this placement is correct.

标签: AtCoder|abc288G

来源

AtCoder|abc288G