Submission #354865

#	Time	Username	Problem	Language	Result	Execution time	Memory
354865		SeDunion	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	276 ms	13292 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 1e6 + 66;

ll f[N];
void upd(int pos, ll v) {
	while (pos < N) {
		f[pos] += v;
		pos |= pos + 1;
	}
}
ll gt(int pos) {
	ll r = 0;
	while (pos >= 0) {
		r += f[pos];
		pos &= pos + 1;
		pos--;
	}
	return r;
}

ll a[N], S, T, All;
int n, q;
ll get(int i) {
	if (i >= n || i < 0) return 0;
	if (a[i] + gt(i) < a[i + 1] + gt(i + 1)) {
		return (a[i] + gt(i) - a[i + 1] - gt(i + 1)) * S;
	} else {
		return (a[i] + gt(i) - a[i + 1] - gt(i + 1)) * T;
	}
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	cin >> n >> q >> S >> T;
	for (int i = 0 ; i <= n ; ++ i) {
		cin >> a[i];
	}
	for (int i = 0 ; i < n ; ++ i) {
		All += get(i);
	}
	while (q--) {
		int l, r; ll x;
		cin >> l >> r >> x;
		All -= get(l-1);
		All -= get(r);
		upd(l, x);
		upd(r+1,-x);
		All += get(l-1);
		All += get(r);
		cout << All << "\n";
	}
}

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