Submission #51480

#	Time	Username	Problem	Language	Result	Execution time	Memory
51480		Vinhspm	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	0 / 100	6 ms	700 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ii pair<int, int>
#define fi first
#define se second
#define pb push_back
const int N = 2009;
const int oo = 1e9;
const int mod = 1e9 + 7;
int n, q, de, inc, sum;
int node[N], la[4*N];
void true_val(int i, int l, int r)	{
	if(l > r || !la[i]) return;
	if(l == r) node[l] += la[i];
	else {
		la[2*i] += la[i];
		la[2*i + 1] += la[i];
	} 
	la[i] = 0;
}
void update(int i, int l, int r, int a, int b, int val)	{
	true_val(i, l, r);
	if(l > r || r < a || l > b) return;
	if(a <= l && r <= b)	{
		la[i] += val;
		return;
	}
	int mid = (l + r) / 2;
	update(2*i, l, mid, a, b, val); update(2*i + 1, mid + 1, r, a, b, val);
}
void getm(int i, int l, int r, int pos)	{
	true_val(i, l, r);
	if(l > pos || pos > r) return;
	if(l == r) return;
	int mid = (l + r) / 2;
	getm(2*i, l, mid, pos); getm(2*i + 1, mid + 1, r, pos);
}
signed main()
{
	//freopen("test.txt", "r", stdin);
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	cin >> n >> q >> de >> inc;
	for(int i = 0; i <= n; ++i) cin >> node[i];
	for(int i = 0; i < n; ++i){
		if(node[i + 1] > node[i]) sum -= de*(node[i + 1] - node[i]);
		else sum += inc*(node[i] - node[i + 1]);
	}
	//cout << sum << '\n';
	while(q --)	{
		int l, r, val; cin >> l >> r >> val;
		if(l > 0) 	{
			getm(1, 0, n, l - 1);
			getm(1, 0, n, l);
			if(node[l] > node[l - 1]) sum += de*(node[l] - node[l - 1]);
			else sum -= inc*(node[l - 1] - node[l]);
		}
		if(r < n) {
			getm(1, 0, n, r + 1);
			getm(1, 0, n, r);
			if(node[r] < node[r + 1]) sum += de*(node[r + 1] - node[r]);
			else sum -= inc*( -node[r + 1] + node[r]);
		}
		update(1, 0, n, l, r, val);
		if(l > 0) 	{
			getm(1, 0, n, l);
			if(l > 0){
				if(node[l] > node[l - 1]) sum -= de*(node[l] - node[l - 1]);
				else sum += inc*(node[l - 1] - node[l]);
			}
		}
		if(r < n) {
			getm(1, 0, n, r);
			if(r < n){
				if(node[r] < node[r + 1]) sum -= de*(node[r + 1] - node[r]);
				else sum += inc*(node[r] - node[r + 1]);
			}
		}
		cout << sum << '\n';
	}
}

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