Submission #1195219

#TimeUsernameProblemLanguageResultExecution timeMemory
1195219Zbyszek99Diversity (CEOI21_diversity)C++20
64 / 100
7090 ms2888 KiB
#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 elm_cnt[300'003];
ll oc_cnt[300'003];
unordered_set<int> non_zero;
int n,q;
int arr[300'001];

void change_num(int x, int p)
{
    oc_cnt[elm_cnt[x]]--;
    if(oc_cnt[elm_cnt[x]] == 0) non_zero.erase(non_zero.find(elm_cnt[x]));
    elm_cnt[x]+=p;
    oc_cnt[elm_cnt[x]]++;
    if(oc_cnt[elm_cnt[x]] == 1) non_zero.insert(elm_cnt[x]);
}

vl oc;

ll get_ans(int n2)
{
    oc = {};
    forall(it,non_zero) oc.pb(it);
    sort(all(oc));
    ll ans = 0;
    ll pref = 0;
    ll suf = 0;
    forall(it,oc)
    {
        ans += oc_cnt[it] * (it * (n2-it) + (it * (it-1)) / 2 + it);
        rep(k,oc_cnt[it])
        {
            if(pref < suf)
            {
                ans += pref * (n2-pref-it);
                pref += it;
            }
            else
            {
                ans += suf * (n2-suf-it);
                suf += it;
            }
        }
    }
    return ans;
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    cin >> n >> q;
    rep(i,n)
    {
        cin >> arr[i];
    }
    oc_cnt[0] = 10000000;
    rep(i,q)
    {
        int l,r;
        cin >> l >> r;
        l--;
        r--;
        rep2(k,l,r) change_num(arr[k],1);
        cout << get_ans(r-l+1) << "\n";
        rep2(k,l,r) change_num(arr[k],-1);
    }
}
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