Submission #483331

#	Time	Username	Problem	Language	Result	Execution time	Memory
483331		BERNARB01	Global Warming (CEOI18_glo)	C++17	25 / 100	95 ms	3688 KiB

glo

#include <bits/stdc++.h>

using namespace std;

const int N = (int) 2e5 + 9;
const int inf = (int) 1e9 + 9;

int n, x, a[N], lis_dp[N], brute_dp[N];

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n >> x;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  int ans = 1;
  fill(lis_dp, lis_dp + n, inf);
  for (int i = 0; i < n; i++) {
    int j = lower_bound(lis_dp, lis_dp + n, a[i]) - lis_dp;
    lis_dp[j] = a[i];
    ans = max(ans, j + 1);
  }
  if (x == 0) {
    cout << ans << '\n';
    return 0;
  }
  if (n * 1LL * n * 1LL * n * 2LL * x <= (int) 2e8) {
    for (int i = 0; i < n; i++) {
      for (int j = i; j < n; j++) {
        for (int k = -x; k <= x; k++) {
          fill(brute_dp, brute_dp + n, inf);
          for (int ii = 0; ii < n; ii++) {
            int jj = lower_bound(brute_dp, brute_dp + n, a[ii] + (i <= ii && ii <= j) * x) - brute_dp;
            brute_dp[jj] = a[ii] + (i <= ii && ii <= j) * x;
            ans = max(ans, jj + 1);
          }
        }
      }
    }
    cout << ans << '\n';
    return 0;
  }
  if (n <= 1000) {
    for (int i = n - 1; i >= 0; i--) {
      a[i] += x;
      fill(brute_dp, brute_dp + n, inf);
      for (int ii = 0; ii < n; ii++) {
        int jj = lower_bound(brute_dp, brute_dp + n, a[ii]) - brute_dp;
        brute_dp[jj] = a[ii];
        ans = max(ans, jj + 1);
      }
    }
    cout << ans << '\n';
    return 0;
  }
  return 0;
}

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