Submission #94516

#	Time	Username	Problem	Language	Result	Execution time	Memory
94516		fedoseevtimofey	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	129 ms	13304 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

#define int long long

signed main() {
    ios_base::sync_with_stdio(false); cin.tie(0); cout.setf(ios::fixed); cout.precision(20);
    #ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif
    int n, q, s, t;
    cin >> n >> q >> s >> t;
    vector <int> a(n + 1);
    for (int i = 0; i < n + 1; ++i) {
        cin >> a[i];
    }
    vector <int> diff(n + 1);
    for (int i = 1; i <= n; ++i) diff[i] = a[i] - a[i - 1];
    ll ans = 0;
    for (int i = 1; i <= n; ++i) {
        if (diff[i] > 0) ans -= (ll)(diff[i]) * s;
        else ans += (ll)(-diff[i]) * t;
    }
    for (int i = 0; i < q; ++i) {
        int l, r, x;
        cin >> l >> r >> x;
        if (diff[l] > 0) {
            ans += (ll)diff[l] * s;
        }
        else {
            ans -= (ll)-diff[l] * t;
        }
        diff[l] += x;
        if (diff[l] > 0) {
            ans -= (ll)diff[l] * s;
        }
        else {
            ans += (ll)-diff[l] * t;
        }

        if (r + 1 <= n) {
            if (diff[r + 1] > 0) {
                ans += (ll)diff[r + 1] * s;
            }
            else {
                ans -= (ll)-diff[r + 1] * t;
            }
            diff[r + 1] -= x;
            if (diff[r + 1] > 0) {
                ans -= (ll)diff[r + 1] * s;
            }
            else {
                ans += (ll)-diff[r + 1] * t;
            }
        }
        cout << ans << '\n';
    }
}

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