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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7.     ios_base::sync_with_stdio(false);
  8.     cin.tie(NULL);
  9.  
  10.     int n;
  11.     long long k;
  12.     if (!(cin >> n >> k)) return 0;
  13.  
  14.     vector<long long> a(n);
  15.     for (int i = 0; i < n; ++i) {
  16.         cin >> a[i];
  17.     }
  18.  
  19.     vector<int> left_mins;
  20.     left_mins.push_back(0);
  21.     for (int i = 1; i < n; ++i) {
  22.         if (a[i] < a[left_mins.back()]) {
  23.             left_mins.push_back(i);
  24.         }
  25.     }
  26.  
  27.     int ans = -1;
  28.     for (int j = n - 1; j >= 0; --j) {
  29.         while (!left_mins.empty() && a[j] - a[left_mins.back()] >= k) {
  30.             if (j > left_mins.back()) {
  31.                 ans = max(ans, j - left_mins.back());
  32.             }
  33.             left_mins.pop_back();
  34.         }
  35.     }
  36.  
  37.     cout << ans << "\n";
  38.  
  39.     return 0;
  40. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/PtUg3j
language:
C++14 (gcc 8.3)
created:
4 hours ago
visibility:
public

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