Submission #1158413

#	Time	Username	Problem	Language	Result	Execution time	Memory
1158413		crispxx	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	0 / 100	78 ms	7672 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define nl '\n'

struct BIT {
	int n; vector<int> bit;
	BIT(int n): n(n), bit(n + 1) {}
	
	void update(int i, int x) {
		for(; i <= n; i += i & -i) bit[i] += x;
	}
	
	int get(int i) {
		int res = 0;
		for(; i >= 1; i -= i & -i) res += bit[i];
		return res; 
	}
	
	void set(int i, int x) {
		update(i, x - (get(i) - get(i - 1)));
	}
};

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	int n, q, s, t; cin >> n >> q >> s >> t;
	
	vector<int> a(n + 1), b(n + 1);
	for(auto &x : a) cin >> x;
	
	BIT fn(n);
	
	for(int i = 1; i <= n; i++) {
		b[i] = a[i - 1] - a[i];
		if(b[i] > 0) fn.set(i, b[i] * t);
		if(b[i] < 0) fn.set(i, b[i] * s);
	}
	
	while(q--) {
		int l, r, x; cin >> l >> r >> x;
		
		b[l] += -x;
		if(b[l] > 0) fn.set(l, b[l] * t);
		if(b[l] < 0) fn.set(l, b[l] * s);
		
		r++;
		
		if(r <= n) {
			b[r] += x;
			if(b[r] > 0) fn.set(r, b[r] * t);
			if(b[r] < 0) fn.set(r, b[r] * s);
		}
		
		cout << fn.get(n) << nl;
	}
}

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