Submission #136257

#	Time	Username	Problem	Language	Result	Execution time	Memory
136257		SOIVIEONE	Global Warming (CEOI18_glo)	C++14	45 / 100	195 ms	6532 KiB

glo

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N = 222222;
ll a[N], l[N], d[N];
pair<int, int> change[N];
int main()
{
	ll n, x;
	cin >> n >> x;
	for(int i = 1; i <= n; i ++)
		cin >> a[i];
	int lis = 0;
	for(int i = 0; i <= n; i ++)
		l[i] = 1e9;
	int ans = 0;
	for(int i = 1; i <= n; i ++)
	{
		int id = lower_bound(l + 1, l + n + 1, a[i]) - l;
		change[i] = {id, l[id]};
		l[id] = a[i];
		ans = max(ans, id);
	}
	int lds = 0;
	for(int i = n; i >= 1; i --)
	{
		int id = lower_bound(d + 1, d + n + 1, a[i] + x, greater<int>()) - d; 
		l[change[i].first] = change[i].second;
		d[id] = a[i] + x;
		// cout << i << ' ' << id << '\n';
		// for(int j = 0; j <= lds - 1; j ++)
			// cout << d[j] << ' ';
		// cout << '\n';
		int it = lower_bound(l + 1, l + n + 1, a[i] + x) - l-1;	
		ans = max(ans, it + id);
	}	
	cout << ans;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:16:6: warning: unused variable 'lis' [-Wunused-variable]
  int lis = 0;
      ^~~
glo.cpp:27:6: warning: unused variable 'lds' [-Wunused-variable]
  int lds = 0;
      ^~~

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