Submission #540204

#	Time	Username	Problem	Language	Result	Execution time	Memory
540204		tkwiatkowski	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	191 ms	13144 KiB

foehn_phenomena

/*
	Zadanie: Foehn Phenomen
	Autor: Tomasz Kwiatkowski
*/

#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back

using namespace std;
typedef long long ll;

const int MAXN = 2e5 + 7;
const int BASE = 1 << 18;

ll segTree[2*BASE + 7];

void Add(int l, int r, int val)
{
	l += BASE - 1;
	r += BASE + 1;
	while (l/2 != r/2) {
		if (l % 2 == 0)
			segTree[l + 1] += val;
		if (r % 2 == 1)
			segTree[r - 1] += val;
		l /= 2;
		r /= 2;
	}
}

ll Get(int i)
{
	i += BASE;
	ll res = segTree[i];
	while (i /= 2)
		res += segTree[i];
	return res;
}

int main()
{
	ios_base::sync_with_stdio(0), cin.tie(0);

	int n, q, s, t;
	cin >> n >> q >> s >> t;
	for (int i = 0; i <= n; ++i) {
		int h;
		cin >> h;
		Add(i, i, h);
	}

	auto delta = [&](int i) {
		if (i == n)
			return (ll)0;
		ll a = Get(i), b = Get(i + 1);
		return (a - b) * (a < b ? s : t);
	};
	ll ans = 0;
	for (int i = 0; i < n; ++i)
		ans += delta(i);

	for (int i = 0; i < q; ++i) {
		int l, r, x;
		cin >> l >> r >> x;
		ans -= delta(l - 1);
		ans -= delta(r);
		Add(l, r, x);
		ans += delta(l - 1);
		ans += delta(r);
		cout << ans << '\n';
	}
	return 0;
}

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