【poj3537】Crosses and Crosses

2014年3月13日1,1430

Description

The game of Crosses and Crosses is played on the field of 1 × n cells. Two players make moves in turn. Each move the player selects any free cell on the field and puts a cross ‘×’ to it. If after the player’s move there are three crosses in a row, he wins.

You are given n. Find out who wins if both players play optimally.

Input

Input file contains one integer number n (3 ≤ n ≤ 2000).

Output

Output ‘1’ if the first player wins, or ‘2’ if the second player does.

Sample Input

#1 3
#2 6

Sample Output

#1 1
#2 2

题解

在第I个位置放一个X,即可分为两个子游戏,I-3和n-I-2