Submission #1305524

#	Time	Username	Problem	Language	Result	Execution time	Memory
1305524		liangjeremy	Global Warming (CEOI18_glo)	C++20	15 / 100	2096 ms	10320 KiB

glo

#include<bits/stdc++.h>
#include<bits/extc++.h>
#define fi first
#define se second
#define int long long
using namespace std;
//using namespace __gnu_pbds;
using db=double;
using ll=int64_t;
using sll=__int128;
using lb=long double;
mt19937 rng(random_device{}()); 

struct BIT{
	vector<int>bits;
	BIT(int n){
		bits.resize(n+20); 
	}
	void update(int index, int delta){
		while(index<bits.size()){
			bits[index]=max(bits[index],delta); 
			index+=index&-index; 
		}
	}
	int query(int index){
		int ans=0; 
		while(index>0){
			ans=max(ans,bits[index]); 
			index-=index&-index; 
		}
		return ans; 
	}
};

int solve(vector<int>v){
	int n=v.size()-1; vector<int>x; 
	for(int i=1; i<=n; i++){ x.push_back(v[i]); }
	sort(x.begin(),x.end()); x.erase(unique(x.begin(),x.end()),x.end()); 
	for(int i=1; i<=n; i++){
		v[i]=lower_bound(x.begin(),x.end(),v[i])-x.begin()+1; 
	}
	BIT bit(n+1); vector<int>dp(n+1); 
	for(int i=1; i<=n; i++){
		dp[i]=bit.query(v[i]-1)+1; bit.update(v[i],dp[i]); 
	}
	return bit.query(n); 
}

int32_t main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	int n,x; cin>>n>>x; vector<int>a(n+1); 
	for(int i=1; i<=n; i++){ cin>>a[i]; }
	int ans=0; 
	for(int delta=-x; delta<=x; delta++){
		for(int i=1; i<=n; i++){
			vector<int>na=a; 
			for(int j=i; j<=n; j++){
				na[j]+=delta; ans=max(ans,solve(na)); 
			}
		}
	}
	cout<<ans<<'\n'; 
}
/*
Overhead the albatross hangs motionless upon the air
And deep beneath the rolling waves in labyrinths of coral caves
The echo of a distant time comes willowing across the sand
And everything is green and submarine
 
And no one showed us to the land
And no one knows the wheres or whys
But something stirs and something tries
And starts to climb towards the light
*/

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