Submission #1308114

#	Time	Username	Problem	Language	Result	Execution time	Memory
1308114		shirokito	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	67 ms	6668 KiB

foehn_phenomena

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

#define all(a) (a).begin(), (a).end()

using ll = long long;

const int N = 2e5 + 24;

int n, q, s, t, a[N];
ll diff[N], sum_pos, sum_neg;

void update(int i, ll x) {
    if (diff[i] > 0) sum_pos -= diff[i];
    else sum_neg -= -diff[i];

    diff[i] += x;

    if (diff[i] > 0) sum_pos += diff[i];
    else sum_neg += -diff[i];
}

void solve() {
    cin >> n >> q >> s >> t;

    for (int i = 0; i <= n; i++) {
        cin >> a[i];
        if (i) diff[i] = a[i] - a[i - 1];
    }

    for (int i = 1; i <= n; i++) {
        if (diff[i] > 0) sum_pos += diff[i];
        else sum_neg += -diff[i];
    }

    while (q--) {
        int l, r, x; cin >> l >> r >> x;
        
        update(l, x); 
        if (r < n) update(r + 1, -x);

        cout << sum_neg * t - sum_pos * s << '\n';
    }
}

signed main() {
    cin.tie(0) -> sync_with_stdio(0);

    int T = 1; // cin >> T;
    while (T--) {
        solve();
    }
}

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