Submission #867658

#	Time	Username	Problem	Language	Result	Execution time	Memory
867658		MongHwa	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	96 ms	13244 KiB

foehn_phenomena

#include <iostream>
using namespace std;

#define ll long long

ll arr[200001], diff[200001];

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

	int n, q; ll s, t;
	cin >> n >> q >> s >> t;

	for(int i = 0; i <= n; i++)
		cin >> arr[i];

	ll neg = 0, pos = 0;
	for(int i = 0; i < n; i++)
	{
		diff[i] = arr[i]-arr[i+1];
		if(diff[i] < 0)
			neg -= diff[i];
		else
			pos += diff[i];
	}

	while(q--)
	{
		int l, r; ll d;
		cin >> l >> r >> d;

		if(diff[l-1] < 0)
			neg += diff[l-1];
		else
			pos -= diff[l-1];

		if(r < n && diff[r] < 0)
			neg += diff[r];
		else if(r < n)
			pos -= diff[r];

		diff[l-1] -= d;
		diff[r] += d;

		if(diff[l-1] < 0)
			neg -= diff[l-1];
		else
			pos += diff[l-1];

		if(r < n && diff[r] < 0)
			neg -= diff[r];
		else if(r < n)
			pos += diff[r];

		cout << -neg*s + pos*t << '\n';
	}
}

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