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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. long long n, a[1000005], mini[1000005], maxi[1000005], res;
  4. int main() {
  5.     ios_base::sync_with_stdio(0);
  6.     cin.tie();
  7.     cout.tie();
  8.     // freopen(".INP", "r", stdin);
  9.     // freopen(".OUT", "w", stdout);
  10.     cin >> n;
  11.     for (long long i = 1; i <= n; i++) {
  12.         cin >> a[i];
  13.     }
  14.     maxi[1] = a[1] * 2;
  15.     for (long long i = 2; i <= n; i++) {
  16.         maxi[i] = max(maxi[i - 1], a[i] * 2);
  17.     }
  18.     mini[n] = a[n];
  19.     for (long long i = n - 1; i >= 1; i--) {
  20.         mini[i] = min(mini[i + 1], a[i]);
  21.     }
  22.     res = 0;
  23.     for (long long i = 2; i <= n - 1; i++) {
  24.         res = max(res, maxi[i - 1] - a[i] - mini[i + 1]);
  25.     }
  26.     cout << res;
  27. }
Success #stdin #stdout 0s 5652KB
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https://ideone.com/UA2aEI
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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