Submission #33263

#	Time	Username	Problem	Language	Result	Execution time	Memory
33263		cheater2k	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	169 ms	4520 KiB

foehn_phenomena

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

const int N = 200005;

int n, q, S, T;
int a[N];
long long c[N];
long long ans;

long long calc(long long v) { if (v < 0) return 1LL * v * S; else return 1LL * v * T; }

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> n >> q >> S >> T;
	for (int i = 0; i <= n; ++i) cin >> a[i];

	for (int i = 0; i <= n - 1; ++i) {
		c[i] = a[i] - a[i+1];
		ans += calc(c[i]);
	}

	while(q--) {
		int l, r, X; cin >> l >> r >> X;
		if (l > 0) {
			ans -= calc(c[l - 1]);
			c[l - 1] -= X;
			ans += calc(c[l - 1]);
		}
		if (r < n) {
			ans -= calc(c[r]);
			c[r] += X;
			ans += calc(c[r]);
		}
		printf("%lld\n", ans);
	}
}

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