HDU 2516 取石子游戏(斐波那契博弈)

#include <iostream>
#include <cstdio>
#include <cmath>
#define ll long long
using namespace std;
ll pre[51];
ll n;
int flag;

void init(){
  pre[0] = 1;
  pre[1] = 1;
  for(int i=2;i<=48;i++){
    pre[i] = pre[i-1] + pre[i-2];
  }
}

int main()
{
  init();
  while(~scanf("%lld",&n)){
    if(n==0) break;
    flag = 0;
    for(int i=2;i<=48;i++){
      if(pre[i] == n){
        flag = 1;
        break;
      }
    }
    if(!flag)printf("First win\n");
    else printf("Second win\n");
  }
  return 0;
}