Codeforces Round 716 (Div. 2)
B
AND 0, Sum Big
Codeforces
1200
原题
← AC →
翻译中…

Baby Badawy's first words were "AND 0 SUM BIG", so he decided to solve the following problem. Given two integers $n$ and $k$, count the number of arrays of length $n$ such that:

翻译中…
  • all its elements are integers between $0$ and $2^k-1$ (inclusive);
  • the bitwise AND of all its elements is $0$;
  • the sum of its elements is as large as possible.
翻译中…

Since the answer can be very large, print its remainder when divided by $10^9+7$.

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Input

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The first line contains an integer $t$ ($1 \le t \le 10$) — the number of test cases you need to solve.

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Each test case consists of a line containing two integers $n$ and $k$ ($1 \le n \le 10^{5}$, $1 \le k \le 20$).

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Output

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For each test case, print the number of arrays satisfying the conditions. Since the answer can be very large, print its remainder when divided by $10^9+7$.

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Note

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In the first example, the $4$ arrays are:

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  • $[3,0]$,
  • $[0,3]$,
  • $[1,2]$,
  • $[2,1]$.
翻译中…

样例

Input #1
2
2 2
100000 20
Output #1
4
226732710
InputCopy OutputCopy
题目信息
题号
1514B
时间限制
2 s
内存限制
256 MB
标签
位运算
组合数学
数学

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