odd doctor 已更新

Key Set

Time Limit
1s
Memory Limit
131072KB
Judge Program
Standard
Ratio(Solve/Submit)
100.00%(1/1)
Description:

soda has a set S with n integers {1,2,…,n}. A set is called key set if the sum of integers in the set is an even number. He wants to know how many nonempty subsets of S are key set.

Input:

There are multiple test cases. The first line of input contains an integer T (1≤T≤105), indicating the number of test cases. For each test case:

The first line contains an integer n (1≤n≤109), the number of integers in the set.

Output:

For each test case, output the number of key sets modulo 1000000007.

Sample Input:
4
1
2
3
4
Sample Output:
0
1
3
7
Source:

2015 Multi-University Training Contest 6


Submit