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"); } }