Submission #209972

#	Time	Username	Problem	Language	Result	Execution time	Memory
209972		AlainSu	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	831 ms	13176 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
const int MAXN=200200;
long long n,q,s,t,d[MAXN]={},a[MAXN]={},ans=0;
void output();
void input()
{
	cin>>n>>q>>s>>t;
	for (int i=0;i<=n;i++)
	    cin>>a[i];
	for (int i=1;i<=n;i++)
	{
		d[i]=a[i]-a[i-1];
		if (d[i]>0) 
		    ans-=d[i]*s;
		else ans-=d[i]*t;
	}
}
void process(long long l,long long r,long long v)
{
	long long ndl=d[l]+v,ndr=d[r]-v;
	if (d[l]<=0 && ndl<=0) ans+=(d[l]-ndl)*t;
	if (d[l]<=0 && ndl>0) ans=ans-ndl*s+d[l]*t;
	if (d[l]>0 && ndl<=0) ans=ans-ndl*t+d[l]*s;
	if (d[l]>0 && ndl>0) ans+=(d[l]-ndl)*s;
	
	if (r<=n)
	{
	    if (d[r]<=0 && ndr<=0) ans+=(d[r]-ndr)*t;
		if (d[r]<=0 && ndr>0) ans=ans-ndr*s+d[r]*t;
		if (d[r]>0 && ndr<=0) ans=ans-ndr*t+d[r]*s;
		if (d[r]>0 && ndr>0) ans+=(d[r]-ndr)*s;
	} 
	d[l]+=v;
	d[r]-=v;
}
void output()
{
	cout<<ans<<endl;
}
int main()
{
	int x,y,v;
	input();
	for (int i=1;i<=q;i++)
	{
		cin>>x>>y>>v;
		process(x,y+1,v);
		output();
	}
	return 0;
 }

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