Submission #748651

#	Time	Username	Problem	Language	Result	Execution time	Memory
748651		pera	Global Warming (CEOI18_glo)	C++14	0 / 100	221 ms	11484 KiB

glo

#include<bits/stdc++.h>

using namespace std;

#define pb push_back
#define ll long long
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

const ll mod = 1e9 + 7;


int main(){
	ios::sync_with_stdio(0);
	cin.tie(0),cout.tie(0);
	int n , x;cin >> n >> x;
	vector<int> a(n + 1) , s(n + 1);
	set<int> dp;
	int ans = 0;
	for(int i = 1;i <= n;i ++){
		cin >> a[i];
		auto it = dp.lower_bound(a[i]);
		if(it == dp.end()) dp.insert(a[i]);
		else{
			dp.erase(it);
			dp.insert(a[i]);
		}
		s[i] = (int)dp.size();
		ans = max(ans , s[i]);
	}
	dp.clear();
	map<int , int> p;
	for(int i = n;i >= 1;i --){
		auto d = dp.lower_bound(x - a[i]);
		ans = max(ans , s[i] + p[*d]);
		auto it = dp.lower_bound(-a[i]);
		if(it == dp.end()) dp.insert(-a[i]) , p[-a[i]] = dp.size() - 1;
		else{
			dp.erase(it);
			dp.insert(-a[i]);
			p[-a[i]] = dp.size() - 1;
		}
	}
	cout << ans << endl;
}

• 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