HDU 1848

sg函数的简单应用

#include<cstdio>#include<string.h>using namespace std;int fib[20],sg[1010],m,n,p;int calsg(int now){int i,tem;int next[20];memset(next,0,sizeof(next));for(i=1;fib[i]<=now;i++){tem=now-fib[i];if(sg[tem]==-1)sg[tem]=calsg(tem);next[sg[tem]]=1;}for(i=0;;i++)if(next[i]==0){return i;}} int main(){int i,j,tem;fib[1]=1;fib[2]=2;for(i=3;i<=16;i++)     // 这里必须到16,15的值是比1000小的，RE死掉了...fib[i]=fib[i-1]+fib[i-2];memset(sg,-1,sizeof(sg));while(scanf("%d %d %d",&m,&n,&p)==3 && !(m==0 && n==0 && p==0)){tem=calsg(m)^calsg(n)^calsg(p);if(tem==0)printf("Nacci\n");else             printf("Fibo\n");}}