제출 #1110444

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1110444		zxcigan	Fish 3 (JOI24_fish3)	C++17	9 / 100	2072 ms	9272 KiB

Main

#include <bits/stdc++.h>

using namespace std;

mt19937_64 rng(time(0));

using ll = long long;
#define int long long

const int N = 2e5 + 1;

void solve() {
    int n, d; cin >> n >> d;
    vector<int> c(n + 1);
    for (int i = 1; i <= n; ++i) {
        cin >> c[i];
    }
    int q; cin >> q;
    while (q--) {
        int l, r; cin >> l >> r;
        vector<int> a = c;
        int res = 0;
        bool bad = 0;
        for (int i = r - 1; i >= l; --i) {
            if (a[i] > a[i + 1]) {
                int p = (a[i] - a[i + 1] + d - 1) / d;
                res += p;
                a[i] -= p * d;
            }
            if (a[i] < 0) {
                bad = 1;
                break;
            }
        }
        cout << (!bad ? res : -1) << '\n';
    }
}

int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif // LOCAL
    int T = 1;
    while (T--) solve();
    return 0;
}

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