BUPT Spring Ranking Contest For 13 Round #1 Math & Games
比赛网址:http://vjudge.net/contest/view.action?cid=44588#overview A题(HDU1850):最简单的NIM游戏,输出变形解题思路:记n1^n2^n3..^n[m]=x显然若x=0,则该局势为奇异局势,必输。如果把ni变成x^ni,则n1^n2^...^n[i-1]^n[i+1]^...^n[m]^x^ni=0,为奇异局势。显然如果ni>x^n