Submission #835225

#	Time	Username	Problem	Language	Result	Execution time	Memory
835225		dungz	Global Warming (CEOI18_glo)	C++17	0 / 100	26 ms	16768 KiB

glo

#pragma GCC optimize ("O2")
#include<bits/stdc++.h>
using namespace std;
#define ll long long 
#define fi first
#define se second
#define endl '\n'
#define task "task"
#define task "task"
#define prll pair<ll,ll>
#define pb push_back
#define ld long double
#define int ll
const ll MIN=-1e18,MAX=1e18,MOD=1e9+7;
map<int,int> danh;
int tree[800005],a[200005],f[200005],f2[200005];
void update(int node,int l,int r,int u,int v)
{
	if(l>u or r<u) return;
	if(l==r)
	{
		tree[node]=max(tree[node],v);
		return;
	}
	int m=(l+r)/2;
	update(node*2,l,m,u,v);
	update(node*2+1,m+1,r,u,v);
	tree[node]=max(tree[node*2],tree[node*2+1]);
}
int get(int node,int l,int r,int u,int v)
{
	if(l>v or r<u) return 0;
	if(l>=u and r<=v) return tree[node];
	int m=(l+r)/2;
	return max(get(node*2,l,m,u,v),get(node*2+1,m+1,r,u,v));
}
vector<int> lst;
signed main(){
	#ifndef ONLINE_JUDGE
   		freopen (task".inp", "r", stdin);
   		freopen (task".out", "w", stdout);
	#endif
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int n,k;
	cin>>n>>k;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i];
		lst.push_back(a[i]);
	}	
	sort(lst.begin(),lst.end());
	int d=0,ans=0;
	for(auto i:lst)
	{
		if(!danh[i])
		{
			danh[i]=++d;
		}
	}
	for(auto i:lst)
	{
		cout<<i<<" ";
	}
	cout<<endl;
	for(int i=1;i<=n;i++)
	{
		f[i]=get(1,1,n,1,danh[a[i]]-1)+1;
		update(1,1,n,danh[a[i]],f[i]);
		ans=max(ans,f[i]);
		// cout<<f[i]<<" ";
	}
	// cout<<endl;
	for(int i=1;i<=4*n;i++) tree[i]=0;
	for(int i=n;i>=1;i--)
	{
		f2[i]=get(1,1,n,danh[a[i]]+1,n)+1;
		update(1,1,n,danh[a[i]],f2[i]);
		// cout<<f2[i]<<" ";
	}
	// cout<<endl;
	for(int i=1;i<=4*n;i++) tree[i]=0;
	for(int i=1;i<=n;i++)
	{
		int idx=lower_bound(lst.begin(),lst.end(),a[i]+k)-lst.begin()-1;
		ans=max(ans,get(1,1,n,1,danh[lst[idx]])+f2[i]);
		// cout<<get(1,1,n,1,danh[lst[idx]])<<" ";
		update(1,1,n,danh[a[i]],f[i]);
	}
	// cout<<endl;
	for(int i=1;i<=4*n;i++) tree[i]=0;
	for(int i=n;i>=1;i--)
	{
		int idx=lower_bound(lst.begin(),lst.end(),a[i]-k+1)-lst.begin();
		// cout<<a[i]<<" "<<idx<<endl;
		// cout<<danh[lst[idx]]<<endl;
		if(danh[lst[idx]]!=0) ans=max(ans,get(1,1,n,danh[lst[idx]],n)+f[i]);
		// cout<<ans<<" ";
		update(1,1,n,danh[a[i]],f2[i]);
	}	
	cout<<ans;
}
/*

*/

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:40:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |      freopen (task".inp", "r", stdin);
      |      ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:41:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |      freopen (task".out", "w", stdout);
      |      ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25