Submission #1195189

#	Time	Username	Problem	Language	Result	Execution time	Memory
1195189		Zbyszek99	Diversity (CEOI21_diversity)	C++20	0 / 100	1 ms	324 KiB

diversity

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
//mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

int zlicz[300'003];

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    int n,q;
    cin >> n >> q;
    rep(i,n)
    {
        int x;
        cin >> x;
        zlicz[x]++;
    }
    vl seg;
    rep2(i,1,300'001)
    {
        if(zlicz[i] > 0) seg.pb(zlicz[i]);
    }
    sort(all(seg));
    ll ans = 0;
    forall(it,seg)
    {
        ans += it * (n-it) + (it * (it-1)) / 2 + it;
    }
    ll pref = 0;
    ll suf = 0;
    forall(it,seg)
    {
        if(pref < suf)
        {
            ans += pref * (n-pref-it);
            pref += it;
        }
        else
        {
            ans += pref * (n-suf-it);
            suf += it;
        }
    }
    cout << ans << "\n";
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 16
• Subtask 5: 0 / 26
• Subtask 6: 0 / 36