Submission #129309

#	Time	Username	Problem	Language	Result	Execution time	Memory
129309		Latina	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	152 ms	6596 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

ll s, t;
ll dif[300005];

ll get(ll d) {
    if (d > 0) return -s*d;
    else return -t*d;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, q; cin >> n >> q >> s >> t;
    vector<int> a(n+1);
    for (int i = 0; i <= n; i++) cin >> a[i];
    ll ans = 0;
    for (int i = 0; i < n; i++) {
    	dif[i] = a[i+1]-a[i];
    	ans += get(dif[i]);
	}
	while (q--) {
		int l, r, x; cin >> l >> r >> x;
		ans -= get(dif[l-1]);
		dif[l-1] += x;
		ans += get(dif[l-1]);
		if (r != n) {
			ans -= get(dif[r]);
			dif[r] -= x;
			ans += get(dif[r]);
		}
		cout << ans << '\n';
	}
	return 0;
}

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