#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];}