Submission #46630

#	Time	Username	Problem	Language	Result	Execution time	Memory
46630		qoo2p5	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	233 ms	169684 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int INF = (int) 1e9 + 1e6 + 123;
const ll LINF = (ll) 1e18 + 1e9 + 123;

#define rep(i, s, t) for (auto i = (s); i < (t); ++(i))
#define per(i, s, t) for (auto i = (s); i >= (t); --(i))
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define mp make_pair
#define pb push_back

bool mini(auto &x, const auto &y) {
    if (y < x) {
        x = y;
        return 1;
    }
    return 0;
}

bool maxi(auto &x, const auto &y) {
    if (y > x) {
        x = y;
        return 1;
    }
    return 0;
}

void run();

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    run();
    return 0;
}

const int N = (int) 2e5 + 123;

int n, q;
ll s, t;
ll a[N], b[N];

ll f(ll x) {
    if (x > 0) {
        return -x * s;
    } else {
        return -x * t;
    }
}

void run() {
    cin >> n >> q >> s >> t;
    rep(i, 0, n + 1) {
        cin >> a[i];
    }
    rep(i, 0, n) {
        b[i] = a[i + 1] - a[i];
    }
    ll ans = 0;
    rep(i, 0, n) {
        ans += f(b[i]);
    }
    while (q--) {
        int l, r;
        ll x;
        cin >> l >> r >> x;
        ans -= f(b[l - 1]);
        b[l - 1] += x;
        ans += f(b[l - 1]);
        if (r < n) {
            ans -= f(b[r]);
            b[r] -= x;
            ans += f(b[r]);
        }
        cout << ans << "\n";
    }
}

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