Submission #365810

#	Time	Username	Problem	Language	Result	Execution time	Memory
365810		inluminas	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	834 ms	15980 KiB

foehn_phenomena

#include"bits/stdc++.h"
using namespace std;

#define ll long long
#define endl "\n"
#define fastio ios_base::sync_with_stdio(false)

const int lmt=2e5+5;
ll a[lmt],n,q,s,t,ans=0,ad[3*lmt];

void updet(int at,int L,int R,int l,int r,ll u){
	if(r<L || R<l) return;
	if(l<=L && R<=r){
		ad[at]+=u;
		return;
	}
	int mid=(L+R)/2;
	updet(at*2,L,mid,l,r,u);
	updet(at*2+1,mid+1,R,l,r,u);
}

ll query(int at,int L,int R,int pos){
	if(pos<L || R<pos) return 0LL;
	if(L==R){
		return a[L]+ad[at];
	}
	int mid=(L+R)/2;
	if(pos<=mid){
		return query(at*2,L,mid,pos)+ad[at];
	}else{
		return query(at*2+1,mid+1,R,pos)+ad[at];
	}
}

int main(){
	fastio;

	cin>>n>>q>>s>>t;
	for(int i=0;i<=n;i++){
		cin>>a[i];
	}
	for(int i=1;i<=n;i++){
		if(a[i-1]<a[i]){
			ans+=((a[i-1]-a[i])*s);
		}else{
			ans+=((a[i-1]-a[i])*t);
		}
	}
	while(q--){
		ll l,r,x;
		cin>>l>>r>>x;
		ll b=query(1,1,n,l-1),c=query(1,1,n,l);
		if(b<c){
			ans-=((b-c)*s);
		}else{
			ans-=((b-c)*t);
		}
		c+=x;
		if(b<c){
			ans+=((b-c)*s);
		}else{
			ans+=((b-c)*t);
		}

		if(r<n){
			b=query(1,1,n,r),c=query(1,1,n,r+1);
			if(b<c){
				ans-=((b-c)*s);
			}else{
				ans-=((b-c)*t);
			}
			b+=x;
			if(b<c){
				ans+=((b-c)*s);
			}else{
				ans+=((b-c)*t);
			}
		}

		updet(1,1,n,l,r,x);
		cout<<ans<<endl;
	}
	return 0;
}

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