HDU 5874 Friends and Enemies

结论。

如果颜色数量$≥$人数的平方除以$4$，那么一定可行；反之不行。

#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<iostream>
using namespace std;
typedef long long LL;
const double pi=acos(-1.0),eps=1e-6;
void File()
{
    freopen("D:\\in.txt","r",stdin);
    freopen("D:\\out.txt","w",stdout);
}
template <class T>
inline void read(T &x)
{
    char c=getchar(); x=0;
    while(!isdigit(c)) c=getchar();
    while(isdigit(c)) {x=x*10+c-'0'; c=getchar();}
}

LL n,m;

int main()
{
    while(~scanf("%lld%lld",&n,&m))
    {
        if(n*n/4<=m) printf("T\n");
        else printf("F\n");
    }
    return 0;
}