Submission #242355

#	Time	Username	Problem	Language	Result	Execution time	Memory
242355		michao	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	232 ms	16376 KiB

foehn_phenomena

#include <bits/stdc++.h>
//#define ll long long int
#define int long long 
#define mp make_pair
#define pb push_back
#define ld long double
#define pii pair<int,int>
#define sz(x) (int)x.size()
#define piii pair<pii,pii>
#define precise cout<<fixed<<setprecision(10)
#define st first
#define nd second
#define ins insert
#define vi vector<int>
#define BOOST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;
int n,q,s,t;
int ans=0;
const int MAX=1<<18;
int tree[2*MAX];
int tab[MAX];
int dp[MAX];
void update(int u,int v,int c)
{
	for (u+=MAX,v+=MAX;u<v;u>>=1,v>>=1)
	{
		if (u&1)tree[u++]+=c;
		if (v&1)tree[--v]+=c;
	}
}
 
int query(int u)
{
	int sum=0;
	for (u+=MAX;u>0;u>>=1)sum+=tree[u];
	return sum;
}
 
int32_t main()
{
  BOOST;
  cin>>n>>q>>s>>t;
  for (int i=0;i<=n;i++)cin>>tab[i],update(i,i+1,tab[i]);
  dp[0]=0;
  for (int i=1;i<=n;i++)
  {
  	if (tab[i]>tab[i-1])dp[i]=dp[i-1]-s*(tab[i]-tab[i-1]);
  	else dp[i]=dp[i-1]+t*(tab[i-1]-tab[i]);
  }
  ans=dp[n];
  for (int z=0;z<q;z++)
  {
  	int l,r,c;
  	cin>>l>>r>>c;
  	//cout<<"ZAWARTOSC "<<z<<"\n";
  	//for (int i=0;i<=n;i++)cout<<query(i)<<" ";
  	//cout<<"\n";
  	int prevl=query(l);
  	int prevr=query(r);
  	update(l,r+1,c);
  	int nowl=query(l);
  	int nowr=query(r);
  	int ilel=query(l-1);
  	int iler=query(r+1);
    int balans=0;
    // pierwsza czesc dla lewego;
    //if (z==2)cout<<"TERAZ "<<ilel<<" "<<prevl<<" "<<nowl<<"\n";
    if (ilel>=prevl)balans-=(ilel-prevl)*t;
    else balans+=(prevl-ilel)*s;
    if (ilel>=nowl)balans+=(ilel-nowl)*t;
    else balans-=(nowl-ilel)*s;
    // druga czesc dla prawego
    if (r!=n)
    {
    	 if (iler<=prevr)balans-=(prevr-iler)*t;
    	 else balans+=(iler-prevr)*s;
    	 if (iler<=nowr)balans+=(nowr-iler)*t;
    	 else balans-=(iler-nowr)*s;
    }
    ans+=balans;
  	cout<<ans<<"\n";
  }
  return 0;
}

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