某dalao贼快的hash？

#include<map>
#include<cstdio>
#include<iostream>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/hash_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
int main()
{
    int n;
    //map<int>mp;
    //mp[23]="132";
    gp_hash_table<int,bool>h;
    h[54]=1;
    cout<<h[54];
}