Submission #863391

#	Time	Username	Problem	Language	Result	Execution time	Memory
863391		Arthas	Global Warming (CEOI18_glo)	C++17	100 / 100	53 ms	3932 KiB

glo

#include <bits/stdc++.h>
using namespace std;

#define all(x) x.begin(),x.end()

const int N = 3e5 + 10, INF = 2e9 + 10;

int n, x, a[N], l[N], ans;
vector <int> v(N, INF);

int main(){
  ios::sync_with_stdio(false);
  cin.tie(NULL);
  cin >> n >> x;
  for (int i = 0; i < n; ++ i){
    cin >> a[i];
  }
  v[0] = -INF;
  for (int i = 0; i < n; ++ i){
    int p = lower_bound (all(v), a[i]) - v.begin();
    v[p] = a[i];
    l[i] = p;
    ans = max (ans, p);
  }
  for (int i = 0; i < n; ++ i){
    v[i] = INF;
  }
  v[0] = -INF;
  for (int i = n - 1; i >= 0; -- i){
    int p = lower_bound (all(v), -a[i] + x) - v.begin();
    ans = max (ans, l[i] + p - 1);
    p = lower_bound (all(v), -a[i]) - v.begin();
    v[p] = -a[i];
  }
  cout << ans;
  return 0;
}

• 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