제출 #1128584

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1128584		fzyzzz_z	Fish 3 (JOI24_fish3)	C++20	9 / 100	2095 ms	3748 KiB

Main

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

using ll = long long; 

const int N = 524288; 

int32_t main() {
    ios_base::sync_with_stdio(false); 
    cin.tie(0); 

    int n; 
    ll d; 
    cin >> n >> d; 
    vector<ll> oc(n); 
    for (auto & x: oc) {
        cin >> x; 
    }


    int q; cin >> q; 
    while (q--) {
        int ql, qr; 
        cin >> ql >> qr; 
        ql--; qr--; 

        ll last = (1LL << 41); 
        ll ans = 0; 
        for (int i = qr; i >= ql; --i) {
            if (oc[i] <= last) {
                last = oc[i]; 
            } else {
                ll ops = ((oc[i] - last) + d - 1) / d; 
                ans += ops; 
                last = oc[i] - ops * d; 
            }
        }
        cout << (last < 0LL ? -1 : ans) << '\n'; 
    }

}

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