Submission #995267

#	Time	Username	Problem	Language	Result	Execution time	Memory
995267		gmroh06	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	85 ms	13232 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using pll = pair<ll, ll>;

inline void fastio() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
}

const ll INF = 1e16;

ll n, q, s, t, sum;
ll arr[200005], diff[200005];

ll cal(ll x) {
    if (x < 0) {
        return -t * x;
    } else {
        return -s * x;
    }
}

int main() {
    fastio();

    cin >> n >> q >> s >> t;

    for (ll i = 0; i <= n; i++) {
        cin >> arr[i];
    }

    for (ll i = 1; i <= n; i++) {
        diff[i] = arr[i] - arr[i - 1];
        sum += cal(diff[i]);
    }

    ll l, r, x;

    while (q--) {
        cin >> l >> r >> x;

        sum -= cal(diff[l]) + (r != n) * cal(diff[r + 1]);

        diff[l] += x;
        diff[r + 1] -= (r != n) * x;

        sum += cal(diff[l]) + (r != n) * cal(diff[r + 1]);

        cout << sum << '\n';
    }

    return 0;
}

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