Submission #581616

#	Time	Username	Problem	Language	Result	Execution time	Memory
581616		colossal_pepe	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	379 ms	28012 KiB

foehn_phenomena

#include <iostream>
using namespace std;

using ll = long long;

struct Node {
    ll t, l, r, lazy;
};

const int N = 300005;

int n, q;
ll a[N], s, t;
Node sgt[4 * N];

void init(int u, int l, int r) {
    if (l == r) {
        sgt[u].t = 0;
        sgt[u].l = a[l];
        sgt[u].r = a[r];
        sgt[u].lazy = 0;
    } else {
        int mid = (l + r) / 2;
        init(2 * u, l, mid);
        init(2 * u + 1, mid + 1, r);
        sgt[u].t = sgt[2 * u].t + sgt[2 * u + 1].t + ((sgt[2 * u].r < sgt[2 * u + 1].l ? s : t) * (sgt[2 * u].r - sgt[2 * u + 1].l));
        sgt[u].l = sgt[2 * u].l;
        sgt[u].r = sgt[2 * u + 1].r;
        sgt[u].lazy = 0;
    }
}

void prop(int u) {
    sgt[2 * u].l += sgt[u].lazy;
    sgt[2 * u].r += sgt[u].lazy;
    sgt[2 * u + 1].l += sgt[u].lazy;
    sgt[2 * u + 1].r += sgt[u].lazy;
    sgt[2 * u].lazy += sgt[u].lazy;
    sgt[2 * u + 1].lazy += sgt[u].lazy;
    sgt[u].lazy = 0;
}

void update(int u, int l, int r, int L, int R, int x) {
    if (l != r) prop(u);
    if (r < L or R < l) return;
    else if (L <= l and r <= R) {
        sgt[u].l += x;
        sgt[u].r += x;
        sgt[u].lazy += x;
    } else {
        int mid = (l + r) / 2;
        update(2 * u, l, mid, L, R, x);
        update(2 * u + 1, mid + 1, r, L, R, x);
        sgt[u].t = sgt[2 * u].t + sgt[2 * u + 1].t + ((sgt[2 * u].r < sgt[2 * u + 1].l ? s : t) * (sgt[2 * u].r - sgt[2 * u + 1].l));
        sgt[u].l = sgt[2 * u].l;
        sgt[u].r = sgt[2 * u + 1].r;
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> q >> s >> t;
    for (int i = 0; i <= n; i++) {
        cin >> a[i];
    }
    init(1, 0, n);
    while (q--) {
        int l, r, x;
        cin >> l >> r >> x;
        update(1, 0, n, l, r, x);
        cout << sgt[1].t << '\n';
    }
    return 0;
}

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