Submission #1171644

#	Time	Username	Problem	Language	Result	Execution time	Memory
1171644		ByeWorld	Diversity (CEOI21_diversity)	C++20	64 / 100	7094 ms	6912 KiB

diversity

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define fi first
#define se second
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii,int> ipii;
const int MAXN = 3e5+10;



signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n, q;
int l=1,r=0;
    cin>>n>>q;
        vector<int> a(n + 1);
    for(int i=1; i<=n; i++)
        cin>>a[i]; 
    
        vector<pair<pair<int, int>, int>> que(q+1);
    for(int p=1; p<=q; p++){
        int l,r;cin>>l>>r;
        que[p] = ipii(pii(l,r), p);
    }
    sort(que.begin(), que.end(), [&](auto a, auto b){
        if(a.fi.fi/500 != b.fi.fi/500) a.fi.fi/500 < b.fi.fi/500;
        if((a.fi.fi/500) & 1) a.fi.se > b.fi.se;
        return a.fi.se < b.fi.se; 
    });

        vector<int> cnt(333333), cnt2(n + 2), nxr(333333), nxl(333333);
        vector<ll>ans(q+2);
    nxl[0] = 0, nxr[0] = n+1, nxl[n+1] = 0, nxr[n+1] = n+1;

    for(auto [xx, idx] : que){
        int le = xx.fi, ri = xx.se;
        while (r + 1 <= ri) {
            r++;

            int x = a[r];
            if (cnt[x] != 0) {
                    cnt2[cnt[x]] -= 1;
                    if (cnt2[cnt[x]] == 0) {
                            if (cnt2[cnt[x] + 1] == 0) {
                                    nxr[cnt[x] + 1] = nxr[cnt[x]];
                                    nxl[nxr[cnt[x]]] = cnt[x] + 1;
                                    nxl[cnt[x] + 1] = nxl[cnt[x]];
                                    nxr[nxl[cnt[x]]] = cnt[x] + 1;
                            } else {
                                    nxl[cnt[x] + 1] = nxl[cnt[x]];
                                    nxr[nxl[cnt[x]]] = cnt[x] + 1;
                            }

                            nxr[cnt[x]] = 0;
                            nxl[cnt[x]] = 0;
                    } else {
                            if (cnt2[cnt[x] + 1] == 0) {
                                    nxr[cnt[x] + 1] = nxr[cnt[x]];
                                    nxl[nxr[cnt[x]]] = cnt[x] + 1;
                                    nxl[cnt[x] + 1] = cnt[x];
                                    nxr[cnt[x]] = cnt[x] + 1;
                            }
                    }
            } else {
                    if (cnt2[cnt[x] + 1] == 0) {
                            nxr[cnt[x] + 1] = nxr[cnt[x]];
                            nxl[nxr[cnt[x]]] = cnt[x] + 1;
                            nxl[cnt[x] + 1] = cnt[x];
                            nxr[cnt[x]] = cnt[x] + 1;
                    }
            }
            
            cnt[x] += 1;
            cnt2[cnt[x]] += 1;
    }

    while (l - 1 >= le) {
            l--;

            int x = a[l];
            if (cnt[x] != 0) {
                    cnt2[cnt[x]] -= 1;
                    if (cnt2[cnt[x]] == 0) {
                            if (cnt2[cnt[x] + 1] == 0) {
                                    nxr[cnt[x] + 1] = nxr[cnt[x]];
                                    nxl[nxr[cnt[x]]] = cnt[x] + 1;
                                    nxl[cnt[x] + 1] = nxl[cnt[x]];
                                    nxr[nxl[cnt[x]]] = cnt[x] + 1;
                            } else {
                                    nxl[cnt[x] + 1] = nxl[cnt[x]];
                                    nxr[nxl[cnt[x]]] = cnt[x] + 1;
                            }

                            nxr[cnt[x]] = 0;
                            nxl[cnt[x]] = 0;
                    } else {
                            if (cnt2[cnt[x] + 1] == 0) {
                                    nxr[cnt[x] + 1] = nxr[cnt[x]];
                                    nxl[nxr[cnt[x]]] = cnt[x] + 1;
                                    nxl[cnt[x] + 1] = cnt[x];
                                    nxr[cnt[x]] = cnt[x] + 1;
                            }
                    }
            } else {
                    if (cnt2[cnt[x] + 1] == 0) {
                            nxr[cnt[x] + 1] = nxr[cnt[x]];
                            nxl[nxr[cnt[x]]] = cnt[x] + 1;
                            nxl[cnt[x] + 1] = cnt[x];
                            nxr[cnt[x]] = cnt[x] + 1;
                    }
            }
            
            cnt[x] += 1;
            cnt2[cnt[x]] += 1;
    }

    while (r-1 >= ri) {
            int x = a[r];
            if (cnt[x] != 1) {
                    cnt2[cnt[x]] -= 1;
                    if (cnt2[cnt[x]] == 0) {
                            if (cnt2[cnt[x] - 1] == 0) {
                                    nxr[cnt[x] - 1] = nxr[cnt[x]];
                                    nxl[nxr[cnt[x]]] = cnt[x] - 1;
                                    nxl[cnt[x] - 1] = nxl[cnt[x]];
                                    nxr[nxl[cnt[x]]] = cnt[x] - 1;
                            } else {
                                    nxr[cnt[x] - 1] = nxr[cnt[x]];
                                    nxl[nxr[cnt[x]]] = cnt[x] - 1;
                            }

                            nxr[cnt[x]] = 0;
                            nxl[cnt[x]] = 0;
                    } else {
                            if (cnt2[cnt[x] - 1] == 0) {
                                    nxr[cnt[x] - 1] = cnt[x];
                                    nxl[cnt[x] - 1] = nxl[cnt[x]];
                                    nxr[nxl[cnt[x]]] = cnt[x] - 1;
                                    nxl[cnt[x]] = cnt[x] - 1;
                            }
                    }
            } else {
                    cnt2[cnt[x]] -= 1;
                    if (cnt2[cnt[x]] == 0) {
                            nxr[cnt[x] - 1] = nxr[cnt[x]];
                            nxl[nxr[cnt[x]]] = cnt[x] - 1;

                            nxr[cnt[x]] = 0;
                            nxl[cnt[x]] = 0;
                    }
            }

            cnt[x] -= 1;
            cnt2[cnt[x]] += 1;

            r--;
    }

    while (l + 1 <= le) {
            int x = a[l];  
            if (cnt[x] != 1) {
                    cnt2[cnt[x]] -= 1;
                    if (cnt2[cnt[x]] == 0) {
                            if (cnt2[cnt[x] - 1] == 0) {
                                    nxr[cnt[x] - 1] = nxr[cnt[x]];
                                    nxl[nxr[cnt[x]]] = cnt[x] - 1;
                                    nxl[cnt[x] - 1] = nxl[cnt[x]];
                                    nxr[nxl[cnt[x]]] = cnt[x] - 1;
                            } else {
                                    nxr[cnt[x] - 1] = nxr[cnt[x]];
                                    nxl[nxr[cnt[x]]] = cnt[x] - 1;
                            }

                            nxr[cnt[x]] = 0;
                            nxl[cnt[x]] = 0;
                    } else {
                            if (cnt2[cnt[x] - 1] == 0) {
                                    nxr[cnt[x] - 1] = cnt[x];
                                    nxl[cnt[x] - 1] = nxl[cnt[x]];
                                    nxr[nxl[cnt[x]]] = cnt[x] - 1;
                                    nxl[cnt[x]] = cnt[x] - 1;
                            }
                    }
            } else {
                    cnt2[cnt[x]] -= 1;
                    if (cnt2[cnt[x]] == 0) {
                            nxr[cnt[x] - 1] = nxr[cnt[x]];
                            nxl[nxr[cnt[x]]] = cnt[x] - 1;

                            nxr[cnt[x]] = 0;
                            nxl[cnt[x]] = 0;
                    }
            }

            cnt[x] -= 1;
            cnt2[cnt[x]] += 1;

            l++;
    }

        // cout << "donemove\n";

        vector<int> v = {nxr[0]};
                while (nxr[v.back()] != n+1) v.push_back(nxr[v.back()]);
                reverse(v.begin(), v.end());

        ll res = 0, f = 0, num = 0, cur = 0, pref = 0, suf = 0;
        for(auto x : v) {
            int c = cnt2[x];

            ll le = (c + (f ^ 1))>>1, ri = (c + f)>>1;

            auto calc = [&](ll y) {
                ll res = (((x * y) * (x * y + 1)) >>1) + 
                    x * x * ((y - 1) * y * (2 * (y - 1) + 1) / 6 + 
                        (((y - 1) * y / 2))>>1);
                return res;
            };

            // le to le and ri to ri
            res += calc(le);
            res += calc(ri);
            // cout << "a: " << res << '\n';

            // le to ri
            res += cur * le * x * ri * x + ((le * (le + 1)>>1) * x) * 
                (ri * x) + (le * x) * (((ri * (ri + 1))>>1) * x);
            // cout << "b: " << res << '\n';

            // le to md
            res += (le * x) * pref;
            res += (((le * (le + 1))>>1) * x) * num;
            // cout << "c: " << res << '\n';

            // md to ri
            res += suf * (ri * x);
            res += num * (((ri * (ri + 1))>>1) * x);
            // cout << "d: " << res << '\n';

            pref = (((le * (le + 1))>>1) * x) + (pref + num * le) + 
                (((ri * (ri + 1))>>1) * x + (ri * x) * (le + cur));
            suf = (((ri * (ri + 1))>>1) * x) + (suf + num * ri) + 
                (((le * (le + 1))>>1) * x + (le * x) * (ri + cur));
            
            num += c * x;
            cur += c;
            f ^= (c & 1);
        }
        ans[idx] = res;
    }
    for(int i=1; i<=q; i++) cout << ans[i] << '\n';
}

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