AtCoder Grand Contest 012
E
Camel and Oases
AtCoder
⌀ 3490
原题
← DF →
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Problem Statement

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There are $N$ oases on a number line. The coordinate of the $i$-th oases from the left is $x_i$.

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Camel hopes to visit all these oases. Initially, the volume of the hump on his back is $V$. When the volume of the hump is $v$, water of volume at most $v$ can be stored. Water is only supplied at oases. He can get as much water as he can store at a oasis, and the same oasis can be used any number of times.

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Camel can travel on the line by either walking or jumping:

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  • Walking over a distance of $d$ costs water of volume $d$ from the hump. A walk that leads to a negative amount of stored water cannot be done.
  • Let $v$ be the amount of water stored at the moment. When $v>0$, Camel can jump to any point on the line of his choice. After this move, the volume of the hump becomes $v/2$ (rounded down to the nearest integer), and the amount of stored water becomes $0$.
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For each of the oases, determine whether it is possible to start from that oasis and visit all the oases.

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Constraints

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  • $2 ≤ N,V ≤ 2 × 10^5$
  • $-10^9 ≤ x_1 < x_2 < ... < x_N ≤ 10^9$
  • $V$ and $x_i$ are all integers.
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Input

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Input is given from Standard Input in the following format:

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N V
x_1 x_2 ... x_{N}

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Output

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Print $N$ lines. The $i$-th line should contain Possible if it is possible to start from the $i$-th oasis and visit all the oases, and Impossible otherwise.

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样例

Input #1
3 2
1 3 6
Output #1
Possible
Possible
Possible
It is possible to start from the first oasis and visit all the oases, as follows: - Walk from the first oasis to the second oasis. The amount of stored water becomes $0$. - Get water at the second oasis. The amount of stored water becomes $2$. - Jump from the second oasis to the third oasis. The amount of stored water becomes $0$, and the volume of the hump becomes $1$.
Input #2
7 2
-10 -4 -2 0 2 4 10
Output #2
Impossible
Possible
Possible
Possible
Possible
Possible
Impossible
A oasis may be visited any number of times.
Input #3
16 19
-49 -48 -33 -30 -21 -14 0 15 19 23 44 52 80 81 82 84
Output #3
Possible
Possible
Possible
Possible
Possible
Possible
Possible
Possible
Possible
Possible
Possible
Possible
Impossible
Impossible
Impossible
Impossible
题目信息
题号
agc012_e
时间限制
2 s
内存限制
256 MB

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