Submission #1150967

#	Time	Username	Problem	Language	Result	Execution time	Memory
1150967		h1euct	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	30 / 100	6 ms	1096 KiB

foehn_phenomena

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

#define fi first
#define se second

#define int long long

const int MX = 1e5 + 5;
const int MOD = 1e9 + 7;

int n, q, s, t;
int a[MX], p[MX];

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	// int test; cin>>test; while (test--) {}	
	cin >> n >> q >> s >> t;
	for (int i = 0; i <= n; i++) cin >> a[i];
	int fn = 0;
	auto get = [&] (int x) {
		if (x < 0) return -t;
		else return -s;
	};
	for (int i = 1; i <= n; i++) {
		p[i] = a[i] - a[i - 1];
		fn += p[i] * get(p[i]);
	}
	// cout << fn << '\n';
	while (q--) {
		int l, r, x; cin >> l >> r >> x;
		fn -= p[l] * get(p[l]);
		p[l] += x;
		fn += p[l] * get(p[l]);
		if (r < n) {
			fn -= p[r + 1] * get(p[r + 1]);
			p[r + 1] -= x;
			fn += p[r + 1] * get(p[r + 1]);
		}
		cout << fn << '\n'; 
	}
	return 0;
}
// binhtinhtutinkhongcaycunhungmotkhikhongcontutinnualatuyetvong

• Subtask 1: 30 / 30
• Subtask 2: 0 / 10
• Subtask 3: 0 / 60