Hacker cup 2013 final problem 4

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Hacker cup 2013 final problem 4

Postby MaxV on Thu May 16, 2013 10:00 am

Rebol is admintted as language in Hacker cup 2013! Can you solve this problem?

Your house has 2 ≤ N ≤ 500,000 distinct rooms. None of the rooms have doors, but every room has a one way teleport which takes you to a different room. The same teleport will always go to the same room. You want to make sure that every room can be reached from every room, via a series of teleports. To do this, you are allowed to change the destination of some (or all) of the teleports.

What is the sum of the minimum number of teleports you have to change to achieve this, over all possible different starting configurations? Two starting configurations are different if for some room, the outgoing teleport goes to different rooms in the two configurations.


The first line contains a single integer T, T ≤ 20. T test cases follow, where each test case consists of one integer: N

Input is a simple TXT (uncompress it):
(235 Bytes) Downloaded 26 times


Output one single line with the sum of the minimum number of teleports you have to change over all possible different starting configurations. Since this number might be very big, output it modulo 1,000,000,007

Example input

Code: Select all

Example output
Code: Select all
Case #1: 0
Case #2: 6
Case #3: 1720
Case #4: 435035973
Case #5: 93930085
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Re: Hacker cup 2013 final problem 4

Postby bogger on Sat Jan 17, 2015 2:29 am

You got your point! and i want intruduce a nice game

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Re: Hacker cup 2013 final problem 4

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