Submission #787899

#	Time	Username	Problem	Language	Result	Execution time	Memory
787899		acatmeowmeow	Foehn Phenomena (JOI17_foehn_phenomena)	C++11	100 / 100	279 ms	15616 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;

#define int long long 

const int N = 2e5;
int n, q, s, t, arr[N + 5], tree[4*N + 5];

void update(int v, int tl, int tr, int k, int x) {
	if (tl == tr) tree[v] += x;
	else {
		int tm = (tl + tr)/2;
		if (k <= tm) update(v*2, tl, tm, k, x);
		else update(v*2 + 1, tm + 1, tr, k, x);
		tree[v] = tree[v*2] + tree[v*2 + 1];
	}
}

int query(int v, int tl, int tr, int l, int r) {
	if (l > r) return 0;
	else if (tl == l && tr == r) return tree[v];
	else {
		int tm = (tl + tr)/2;
		return query(v*2, tl, tm, l, min(tm, r)) + query(v*2 + 1, tm + 1, tr, max(l, tm + 1), r);
	}
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin >> n >> q >> s >> t;
	for (int i = 0; i <= n; i++) {
		cin >> arr[i];
		update(1, 0, n + 1, i, arr[i]);
		update(1, 0, n + 1, i + 1, -arr[i]);
	}
	int ans = 0;
	for (int i = 0; i < n; i++) {
		if (arr[i] < arr[i + 1]) ans -= s*abs(arr[i] - arr[i + 1]);
		else ans += t*abs(arr[i] - arr[i + 1]);
	}
	while (q--) {
		int l, r, x;
		cin >> l >> r >> x;

		int pl = query(1, 0, n + 1, 0, l - 1), curl = query(1, 0, n + 1, 0, l);
		if (pl < curl) ans += s*abs(pl - curl);
		else ans -= t*abs(pl - curl);

		int nr = query(1, 0, n + 1, 0, r + 1), curr = query(1, 0, n + 1, 0, r);
		if (r < n && curr < nr) ans += s*abs(nr - curr);
		else if (r < n) ans -= t*abs(nr - curr);

		update(1, 0, n + 1, l, x);
		update(1, 0, n + 1, r + 1, -x);

		curl += x;
		if (pl < curl) ans -= s*abs(pl - curl);
		else ans += t*abs(pl - curl);

		curr += x;
		if (r < n && curr < nr) ans -= s*abs(curr - nr);
		else if (r < n) ans += t*abs(curr - nr);

		cout << ans << '\n';
	}
	return 0;
}

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