Submission #580480

#	Time	Username	Problem	Language	Result	Execution time	Memory
580480		juggernaut	Global Warming (CEOI18_glo)	C++14	100 / 100	403 ms	107888 KiB

glo

#include<bits/stdc++.h>
#define fr first
#define sc second
using namespace std;
typedef long long ll;
typedef long double ld;
#define USING_ORDERED_SET 0
#if USING_ORDERED_SET
#include<bits/extc++.h>
using namespace __gnu_pbds;
template<class T>using ordered_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
#endif
template<class T>void umax(T &a,T b){if(a<b)a=b;}
template<class T>void umin(T &a,T b){if(b<a)a=b;}
#ifdef juggernaut
    #define printl(args...) printf(args)
#else
    #define printl(args...) 0
#endif
int n,x;
int a[200005];
int inf=1e9+5;
struct node{
	int l,r,val;
	node(){
		l=r=val=0;
	}
};
struct SegmentTree{
	vector<node>tree;
	void build(){
		tree.clear();
		tree.push_back(node());
		tree.push_back(node());
	}
	int get(int v,int l,int r,int ql,int qr){
		if(qr<l||r<ql)return 0;
		if(!v)return 0;
		if(ql<=l&&r<=qr)return tree[v].val;
		int mid=(l+r)>>1;
		return max(get(tree[v].l,l,mid,ql,qr),get(tree[v].r,mid+1,r,ql,qr));
	}
	void update(int v,int l,int r,int pos,int val){
		umax(tree[v].val,val);
		int mid=(l+r)>>1;
		if(l==r)return;
		if(pos<=mid){
			if(!tree[v].l){
				tree[v].l=(int)tree.size();
				tree.push_back(node());
			}
			update(tree[v].l,l,mid,pos,val);
		}else{
			if(!tree[v].r){
				tree[v].r=(int)tree.size();
				tree.push_back(node());
			}
			update(tree[v].r,mid+1,r,pos,val);
		}
	}
}dp[2];
int pref[200005];
int suff[200005];
int main(){
	scanf("%d%d",&n,&x);
	for(int i=1;i<=n;i++)scanf("%d",&a[i]);
	int ans=0;
	dp[1].build();
	for(int i=n;i>0;i--){
		int cur=1;
		umax(cur,dp[1].get(1,0,inf,a[i]+1,inf)+1);
		dp[1].update(1,0,inf,a[i],cur);
		suff[i]=cur;
	}
	ans=suff[1];
  dp[0].build();
	for(int i=1;i<=n;i++){
		int cur=1;
		umax(cur,dp[0].get(1,0,inf,0,a[i]-1)+1);
		dp[0].update(1,0,inf,a[i],cur);
		pref[i]=cur;
		umax(ans,suff[i+1]+dp[0].get(1,0,inf,0,min(a[i+1]-1+x,inf)));
	}
	cout<<ans;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:65:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |  scanf("%d%d",&n,&x);
      |  ~~~~~^~~~~~~~~~~~~~
glo.cpp:66:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |  for(int i=1;i<=n;i++)scanf("%d",&a[i]);
      |                       ~~~~~^~~~~~~~~~~~

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