测试数据 #0: Accepted, time = 0 ms, mem = 2128 KiB, score = 9
测试数据 #1: Accepted, time = 0 ms, mem = 2132 KiB, score = 9
测试数据 #2: Accepted, time = 187 ms, mem = 2120 KiB, score = 9
测试数据 #3: Accepted, time = 218 ms, mem = 2128 KiB, score = 9
测试数据 #4: Accepted, time = 0 ms, mem = 2128 KiB, score = 9
测试数据 #5: Accepted, time = 0 ms, mem = 2124 KiB, score = 9
测试数据 #6: Accepted, time = 93 ms, mem = 2128 KiB, score = 9
测试数据 #7: Accepted, time = 0 ms, mem = 2128 KiB, score = 9
测试数据 #8: Accepted, time = 15 ms, mem = 2132 KiB, score = 9
测试数据 #9: Accepted, time = 109 ms, mem = 2124 KiB, score = 9
测试数据 #10: Accepted, time = 15 ms, mem = 2128 KiB, score = 10
Accepted, time = 637 ms, mem = 2132 KiB, score = 100；
疑问：
令t=大神排列数。
根据费马小定理，应该令t%=1000000006;cout<<2^t%1000000007;
但是只能过3组，而令t对1000000007取余却AC了。