Submission #1019982

#	Time	Username	Problem	Language	Result	Execution time	Memory
1019982		vjudge1	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	87 ms	12372 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;

int a[200005];

long long c[200005];

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	int n, q, s, t;
	
	cin >> n >> q >> s >> t;
	
	for (int i = 0; i <= n; ++i) {
		cin >> a[i];
	}
	
	long long ans = 0;
	
	for (int i = 1; i <= n; ++i) {
		c[i] = a[i - 1] - a[i];
		
		if (c[i] < 0) {
			ans += 1ll * c[i] * s;
		} else {
			ans += 1ll * c[i] * t;
		}
	}
	
	while (q--) {
		int l, r, x;
		
		cin >> l >> r >> x;
		
		if (c[l] < 0) {
			ans -= 1ll * c[l] * s;
		} else {
			ans -= 1ll * c[l] * t;
		}
		
		if (r + 1 <= n) {
			if (c[r + 1] < 0) {
				ans -= 1ll * c[r + 1] * s;
			} else {
				ans -= 1ll * c[r + 1] * t;
			}
		}
		
		
		c[l] -= x;
		if (r + 1 <= n) {
			c[r + 1] += x;
		}

		if (c[l] < 0) {
			ans += 1ll * c[l] * s;
		} else {
			ans += 1ll * c[l] * t;
		}
		
		if (r + 1 <= n) {
			if (c[r + 1] < 0) {
				ans += 1ll * c[r + 1] * s;
			} else {
				ans += 1ll * c[r + 1] * t;
			}
		}
		
		cout << ans << '\n';
	}
}

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