Submission #395767

#	Time	Username	Problem	Language	Result	Execution time	Memory
395767		kaplanbar	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	133 ms	11740 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, q, s, t;
    cin >> n >> q >> s >> t;
    
    vector<ll> d;

    int last = 0;
    for(int i = 0; i < n + 1; i++) {
        int x;
        cin >> x;
        if(i) {
            d.push_back(x - last);
        }
        last = x;
    }

    auto calculate_val = [&](ll x) -> ll {
        if(x < 0) return x * t;
        else return x * s;
    };

    ll cur = 0;
    for(ll x : d) {
        cur += calculate_val(x);
    }


    for(int i = 0; i < q; i++) {
        int l, r, x;
        cin >> l >> r >> x;

        cur -= calculate_val(d[l - 1]);
        d[l - 1] += x;
        cur += calculate_val(d[l - 1]);

        if(r != n) {
            cur -= calculate_val(d[r]);
            d[r] -= x;
            cur += calculate_val(d[r]);
        }

        cout << -cur << "\n";
        
    }

    return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60