卖萌型选手

https://ac.nowcoder.com/acm/contest/321/G

题解：STL+预处理+数学

/*
*@Author:   STZG
*@Language: C++
*/
#include <bits/stdc++.h>
#include<iostream>
#include<algorithm>
#include<cstdlib>
#include<cstring>
#include<cstdio>
#include<string>
#include<vector>
#include<bitset>
#include<queue>
#include<deque>
#include<stack>
#include<cmath>
#include<list>
#include<map>
#include<set>
//#define DEBUG
//#define RI register int
using namespace std;
typedef long long ll;
typedef __int128 lll;
const int N=10000000;
const int MOD=1e9+7;
const double PI = acos(-1.0);
const double EXP = 1E-8;
const int INF = 0x3f3f3f3f;
ll t,n,m,k,q;
ll a[N];
int main()
{
#ifdef DEBUG
	freopen("input.in", "r", stdin);
	//freopen("output.out", "w", stdout);
#endif
int cnt=0;
    for(ll i=0;i*(i+1)*(2*i+1)/6<=1e18;i++){
        a[i]=i*(i+1)*(2*i+1)/6;cnt++;
    }
    scanf("%lld",&t);
    while(t--){
        scanf("%lld",&n);
        k=lower_bound(a,a+cnt,n)-a;
        if(a[k]!=n)
            --k;
        cout <<a[k]<< endl;
    }
    //cout << "Hello world!" << endl;
    return 0;
}