Submission #755495

#	Time	Username	Problem	Language	Result	Execution time	Memory
755495		PixelCat	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	160 ms	11532 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define For(i, a, b) for(int i = a; i <= b; i++)
#define Forr(i, a, b) for(int i = a; i >= b; i--)
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define sz(x) ((int)x.size())
#define eb emplace_back
#define int LL
using namespace std;
using LL = long long;
using pii = pair<int, int>;

const int MAXN = 200020;

int a[MAXN];

int32_t main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    // =^-w-^=
    int n, q, s, t; cin >> n >> q >> s >> t;
    For(i, 0, n) cin >> a[i];
    Forr(i, n, 1) a[i] -= a[i - 1];
    
    auto cost = [&](int x) {
        x = a[x];
        if(x >= 0) return -(x * s);
        return -(x * t);
    };
    int ans = 0;
    For(i, 1, n) ans += cost(i);

    while(q--) {
        int l, r, x; cin >> l >> r >> x; r++;
        ans -= cost(l); a[l] += x; ans += cost(l);
        if(r <= n) {
            ans -= cost(r); a[r] -= x; ans += cost(r);
        }
        cout << ans << "\n";
    }
    return 0;
}

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