Submission #984701

#	Time	Username	Problem	Language	Result	Execution time	Memory
984701		vjudge2	Fish 3 (JOI24_fish3)	C++17	27 / 100	161 ms	17632 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define int long long

int32_t main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int n, k, q;
    cin >> n >> k;
    vector<int> c(n+1), ac(n+1, 0), a(n+1, 0), b(n+1, 0), aff(n+1, 0);
    for (int i = 1; i <= n; i++) {
        cin >> c[i];
        ac[i] = c[i];
    }
    int prv = n;
    for (int i = n - 1; i >= 1; i--) {
        if (ac[i] > ac[i + 1]) {
            int diff = ac[i] - ac[i + 1];
            diff = (diff + k - 1) / k;
            a[i] += diff;
            ac[i] -= diff * k;
        } else {
            int t = 0;
            for (int j = i + 1; j <= prv; j++) t++, aff[j] = t;
            prv = i;
        }
    }
    int t = 0;
    for (int j = 1; j <= prv; j++) t++, aff[j] = t;
    for (int i = 1; i <= n; i++) a[i] += a[i - 1];
    cin >> q;
    while (q--) {
        int l, r;
        cin >> l >> r;
        // cout << a[r] - a[l - 1] << '\n';
        // cout << ((c[r] - ac[r]) / k) * (r - l + 1) << '\n';
        int L = ac[l], R = ac[r];
        L += (c[r] - R);
        if (L < 0) cout << "-1\n";
        else cout << a[r] - a[l - 1] - ((c[r] - ac[r]) / k) * min(aff[r], r - l + 1) << '\n';
    }
}

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