Submission #1179883

#	Time	Username	Problem	Language	Result	Execution time	Memory
1179883		Paz15	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	30 / 100	103 ms	7628 KiB

foehn_phenomena

//fast
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;

#define rep(n) for(int i = 0 ; i<n ; i++)
#define all(x) x.begin(),x.end()
#define pb push_back

const int base = 2e5+7;
const int tbase = (1<<18);
ll tree[tbase*2];
ll alt[base];
ll s,t,n;

void dod(int a, int b, ll x){
	a+=tbase-1;
	b+=tbase+1;
	while (b-a>1){
		if (a%2==0) tree[a+1]+=x;
		if (b%2==1) tree[b-1]+=x;
		a/=2;
		b/=2;
	}
}

int zap(int x){
	ll w = alt[x];
	x+=tbase;
	while (x>=1){
		w+=tree[x];
		x/=2;
	}
	return w;
}

ll update(int l, int r){
	ll w = 0;
	if (l!=0){
		ll a = zap(l-1);
		ll b = zap(l);
		if (a>b) w+=(a-b)*t;
		else w+=(a-b)*s;
	}
	if (r!=n){
		ll a = zap(r);
		ll b = zap(r+1);
		if (a>b) w+=(a-b)*t;
		else w+=(a-b)*s;
	}
	return w;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int q;
	cin >> n >> q >> s >> t;
	ll sum = 0;
	cin >> alt[0];
	rep(n){
		cin >> alt[i+1];
		if (alt[i]>alt[i+1]){
			sum+=(alt[i]-alt[i+1])*t;
		}else sum+=(alt[i]-alt[i+1])*s;
	}
	while (q--){
		int l,r,x;
		cin >> l >> r >> x;
		sum-=update(l,r);
		dod(l,r,x);
		sum+=update(l,r);
		cout << sum << '\n';
	}
}

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