Submission #1203812

#	Time	Username	Problem	Language	Result	Execution time	Memory
1203812		chawinkn	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	71 ms	7240 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;

#define int long long

signed main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL);
	int n, q, s, t;
	cin >> n >> q >> s >> t;
	vector<int> a(n+1), diff(n);
	for (auto& i : a)
		cin >> i;
	auto cal = [&](int d) {
		return -d*(d >= 0 ? s : t);
	};
	int ans=0;
	for (int i = 0; i < n; i++)
		diff[i] = a[i+1]-a[i], ans += cal(diff[i]);
	while (q--) {
		int l, r, x;
		cin >> l >> r >> x;
		ans -= cal(diff[l-1]);
		diff[l-1] += x;
		ans += cal(diff[l-1]);
		if (r < n) {
			ans -= cal(diff[r]);
			diff[r] -= x;
			ans += cal(diff[r]);
		}
		cout << ans << "\n";
	}
	return 0;
}

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