Future Failure

5

1 votes
Combinatorics, Hard, Math
Problem

Alice and Bob are playing a game with a string of characters, with Alice going first. The string consists n characters, each of which is one of the first k letters of the alphabet. On a player’s turn, they can either arbitrarily permute the characters in the words, or delete exactly one character in the word (if there is at least one character). In addition, their resulting word cannot have appeared before throughout the entire game. The player unable to make a valid move loses the game.

Given n,k,p, find the number of words with exactly n characters consisting of the first k letters of the alphabet such that Alice will win if both Alice and Bob play optimally. Return this number modulo the prime number p.

Input Format

The first line of input will contain three integers n,k,p.

Output Format

Print a single integer, the number of winning words for Alice, modulo p.

Constraints

1n250000

1k26

108p109+100

p will be prime

Time Limit: 2
Memory Limit: 256
Source Limit:
Explanation

There are 14 strings that that Alice can win with. For example, some strings are "bbaa" and "baaa". Alice will lose on strings like "aaaa" or "bbbb".

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