Submission #927617

#	Time	Username	Problem	Language	Result	Execution time	Memory
927617		math_rabbit_1028	Measures (CEOI22_measures)	C++14	76 / 100	296 ms	39844 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;
typedef long long ll;

int N, M;
ll D;
vector<pii> arr;
int ord[202020];

int cnt = 0;
struct segtree {
    ll lt[808080], rt[808080], mx[808080], sum[808080];
    void update(int v, int st, int ed, int idx, ll val) {
        if (st > idx || ed < idx) return;
        if (st == ed) {
            lt[v] = rt[v] = mx[v] = sum[v] = val;
            return;
        }
        int mid = (st+ed)/2;
        update(2*v, st, mid, idx, val);
        update(2*v+1, mid+1, ed, idx, val);

        lt[v] = max(lt[2*v], lt[2*v+1] + sum[2*v]);
        rt[v] = max(rt[2*v+1], rt[2*v] + sum[2*v+1]);
        mx[v] = max(mx[2*v], mx[2*v+1]);
        mx[v] = max(mx[v], rt[2*v]+lt[2*v+1]);
        sum[v] = sum[2*v] + sum[2*v+1];
    }
} seg;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie();

    cin >> N >> M >> D;

    for (int i = 1; i <= M; i++) {
        int a; cin >> a;
        arr.push_back({a, i});
    }
    sort(arr.begin(), arr.end());
    for (int i = 0; i < M; i++) ord[arr[i].second] = i;
    
    set<int> S;
    for (int i = 1; i <= M; i++) {
        if (!S.empty()) {
            auto it = S.lower_bound(ord[i]);
            if (it != S.end()) seg.update(1, 1, M, *it, D - (arr[*it].first-arr[ord[i]].first));
            if (it == S.begin()) seg.update(1, 1, M, ord[i], 0);
            else {
                it--;
                seg.update(1, 1, M, ord[i], D - (arr[ord[i]].first-arr[*it].first));
            }
            
        }
        ll ans = seg.mx[1];
        if (ans%2) cout << ans/2 << ".5 ";
        else cout << ans/2 << " ";
        S.insert(ord[i]);
    }

    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 14
• Subtask 3: 35 / 35
• Subtask 4: 41 / 41