Submission #1203507

#	Time	Username	Problem	Language	Result	Execution time	Memory
1203507		LucaIlie	Fish 3 (JOI24_fish3)	C++20	55 / 100	329 ms	79620 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 3e5;
const int MAX_LOG_N = 18;
const long long INF = 1e18;
int n;
long long d;
long long a[MAX_N + 1], sumA[MAX_N + 1];
long long c[MAX_N + 1];
int nxt[MAX_LOG_N + 1][MAX_N + 1];
long long cost[MAX_LOG_N + 1][MAX_N + 1];

long long getCost(int l, int r) {
    return (sumA[r] - sumA[l - 1] - a[r] * (r - l + 1)) / d;
}

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

    cin >> n >> d;
    for (int i = 1; i <= n; i++) 
        cin >> c[i];

    for (int i = n; i >= 1; i--) 
        a[i] = (c[i] + a[i + 1] - c[i + 1] + d - 1) / d * d;
    a[0] = -1;

    for (int i = 1; i <= n; i++)
        sumA[i] = sumA[i - 1] + a[i];

    vector<int> st;
    st.push_back(0);
    for (int i = 1; i <= n; i++) {
        while (a[i] <= a[st.back()])
            st.pop_back();
        nxt[0][i] = st.back();
        cost[0][i] = getCost(nxt[0][i] + 1, i);
        st.push_back(i);
    }

    for (int p = 1; (1 << p) <= n; p++) {
        for (int i = 1; i <= n; i++) {
            nxt[p][i] = nxt[p - 1][nxt[p - 1][i]]; 
            cost[p][i] = cost[p - 1][i] + cost[p - 1][nxt[p - 1][i]];
        }
    }


    int q;
    cin >> q;
    for (; q > 0; q--) {
        int l, r;
        cin >> l >> r;

        if (a[l] - c[l] > a[r]) {
            cout << "-1\n";
            continue;
        }

        long long ans = 0;
        for (int p = log2(n); p >= 0; p--) {
            if (nxt[p][r] >= l) {
                ans += cost[p][r];
                r = nxt[p][r];
            }
        }
        ans += getCost(l, r);
        cout << ans << "\n";
    }

    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 7 / 7
• Subtask 3: 28 / 28
• Subtask 4: 20 / 20
• Subtask 5: 0 / 36