Submission #375522

#	Time	Username	Problem	Language	Result	Execution time	Memory
375522		astoria	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	175 ms	13164 KiB

foehn_phenomena

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

#define int long long

int32_t main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL); cout.tie(NULL);
	int n,q,s,t; cin>>n>>q>>s>>t;
	int a[n+5];
	for(int i=0; i<=n; i++) cin>>a[i];
	int d[n+5];
	for(int i=1; i<=n; i++) d[i] = a[i] - a[i-1];
	
	int tot=0;
	for(int i=1; i<=n; i++){
		if(d[i]>0) tot -= (s*d[i]); //altitude inc so temp dec
		else tot -= (t*d[i]); //altitude dec so temp inc
	}
		
	for(int i=0; i<q; i++){
		int l,r,x; cin>>l>>r>>x;
		if(d[l]>0) tot += (s*d[l]);
		else tot += (t*d[l]);
		d[l] += x;
		if(d[l]>0) tot -= (s*d[l]);
		else tot -= (t*d[l]);
				
		if(r==n){ cout<<tot<<"\n"; continue;}
		if(d[r+1]>0) tot += (s*d[r+1]);
		else tot += (t*d[r+1]);
		d[r+1] -= x;
		if(d[r+1]>0) tot -= (s*d[r+1]);
		else tot -= (t*d[r+1]);
		cout<<tot<<"\n";
	}
}

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