Submission #753623

#	Time	Username	Problem	Language	Result	Execution time	Memory
753623		ByeWorld	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	989 ms	19832 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define ll long long
#define int long long
using namespace std;
typedef pair<int,int> pii;
typedef pair<int, pii> ipii;
const int MAXN = 2e5+10;
const int INF = 1e9;
const int MOD = 1e9+7;

int n, q, s, t;
int a[MAXN];
int up, dw;
int st[4*MAXN], laz[4*MAXN];

int bd(int id, int l, int r){
	if(l==r) return st[id] = a[l];
	return st[id] = bd(2*id, l, (l+r)/2) + bd(2*id+1, (l+r)/2+1, r);
}
void bnc(int id){
	if(laz[id] == 0) return;
	laz[2*id] += laz[id];
	st[2*id] += laz[id];
	laz[2*id+1] += laz[id];
	st[2*id+1] += laz[id];
	laz[id] = 0;
}
int que(int id, int l, int r, int x){
	if(r<x || x<l) return 0;
	if(l==r && l==x) return st[id];
	bnc(id);
	return que(2*id, l, (l+r)/2, x) + que(2*id+1, (l+r)/2+1, r, x);
}
int upd(int id, int l, int r, int x, int y, int p){
	if(r<x || y<l) return st[id];
	if(x<=l && r<=y){
		laz[id] += p;
		return st[id] += p;
	}
	bnc(id);
	return st[id] = upd(2*id, l, (l+r)/2, x, y, p) + upd(2*id+1, (l+r)/2+1, r, x, y, p);
}
signed 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=1; i<=n; i++){
		int te = a[i]-a[i-1];
		if(te < 0) dw += te;
		else up += te;
	}
	bd(1, 1, n);

	for(int i=1; i<=q; i++){
		int l, r, p; cin >> l >> r >> p;
		int al = que(1, 1, n, l); int al1 = que(1, 1, n, l-1);
		int te = al-al1;
		if(te < 0) dw -= te;
		else up -= te;

		if(r!=n){
			int ar = que(1, 1, n, r); int ar1 = que(1, 1, n, r+1);
			te = ar1-ar;
			if(te < 0) dw -= te;
			else up -= te;
		}

		upd(1, 1, n, l, r, p);
		//cout << al << ' ' << al1 << ' ' << ar1 << ' '<< ar << "ar\n";
		al = que(1, 1, n, l);
		te = al-al1;
		if(te < 0) dw += te;
		else up += te;
		
		if(r!=n){
			int ar = que(1, 1, n, r); int ar1 = que(1, 1, n, r+1);
			te = ar1-ar;
			if(te < 0) dw += te;
			else up += te;
		}
	//cout << dw << ' ' << up << "dw\n";
		cout << dw*(-t) + up*(-s) << '\n';
	}
}

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