Submission #748658

#	Time	Username	Problem	Language	Result	Execution time	Memory
748658		pera	Global Warming (CEOI18_glo)	C++14	100 / 100	61 ms	6972 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()

#define int ll

const ll mod = 1e9 + 7;


main(){
	ios::sync_with_stdio(0);
	cin.tie(0),cout.tie(0);
	int n , x;cin >> n >> x;
	vector<int> a(n) , s(n);
	vector<int> dp(n , LLONG_MAX);
	int ans = 0;
	for(int i = 0;i < n;i ++){
		cin >> a[i];
		int w = lower_bound(all(dp) , a[i]) - dp.begin();
		dp[w] = a[i];
		s[i] = w + 1;
		ans = max(ans , s[i]);
	}
	for(int i = 0;i < n;i ++) dp[i] = LLONG_MAX;
	for(int i = n - 1;i > -1;i --){
		int j = lower_bound(all(dp) , x - a[i]) - dp.begin();
		int y = lower_bound(all(dp) , -a[i]) - dp.begin();
		//cout << s[i] << " " << j << endl;
		ans = max(ans , s[i] + j);
		dp[y] = -a[i];
	}
	cout << ans << endl;
}

Compilation message (stderr)

glo.cpp:15:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   15 | main(){
      | ^~~~

• 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