#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pl;
typedef pair<int,int> pii;
typedef tuple<int,int,int> tt;
#define all(a) a.begin(), a.end()
#define filter(a) a.erase(unique(all(a)), a.end())
const int mn = 2e5 + 5;
ll a[mn], ap[mn], as[mn], prf[mn], sfx[mn];
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
int n; cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
for (int i = 1; i <= n; i++)
ap[i] = max(ap[i - 1] + 1, a[i] + prf[i - 1]), prf[i] = max(prf[i - 1], ap[i] - a[i]);
for (int i = n; i >= 1; i--)
as[i] = max(as[i + 1] + 1, a[i] + sfx[i + 1]), sfx[i] = max(sfx[i + 1], as[i] - a[i]);
ll ans = LLONG_MAX;
for (int i = 1; i <= n; i++)
ans = min(ans, max(prf[i], sfx[i]));
cout << ans;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 4 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 7 |
Correct |
2 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 11 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 12 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 13 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 14 |
Correct |
1 ms |
2648 KB |
Output is correct |
| 15 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 16 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 17 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 18 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 19 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 20 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 21 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 22 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 23 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 24 |
Correct |
1 ms |
2396 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 2 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 4 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 7 |
Correct |
2 ms |
2396 KB |
Output is correct |
| 8 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 11 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 12 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 13 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 14 |
Correct |
1 ms |
2648 KB |
Output is correct |
| 15 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 16 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 17 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 18 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 19 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 20 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 21 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 22 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 23 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 24 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 25 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 26 |
Correct |
20 ms |
10076 KB |
Output is correct |
| 27 |
Correct |
20 ms |
10068 KB |
Output is correct |
| 28 |
Correct |
23 ms |
10324 KB |
Output is correct |
| 29 |
Correct |
20 ms |
10068 KB |
Output is correct |
| 30 |
Correct |
16 ms |
9308 KB |
Output is correct |
| 31 |
Correct |
19 ms |
10068 KB |
Output is correct |
| 32 |
Correct |
26 ms |
10136 KB |
Output is correct |
| 33 |
Correct |
19 ms |
10064 KB |
Output is correct |
| 34 |
Correct |
19 ms |
10076 KB |
Output is correct |
| 35 |
Correct |
15 ms |
9308 KB |
Output is correct |
| 36 |
Correct |
15 ms |
9440 KB |
Output is correct |
| 37 |
Correct |
16 ms |
9308 KB |
Output is correct |
| 38 |
Correct |
22 ms |
10068 KB |
Output is correct |
| 39 |
Correct |
19 ms |
10044 KB |
Output is correct |
| 40 |
Correct |
20 ms |
10144 KB |
Output is correct |
| 41 |
Correct |
19 ms |
10076 KB |
Output is correct |
| 42 |
Correct |
18 ms |
9812 KB |
Output is correct |
| 43 |
Correct |
23 ms |
10076 KB |
Output is correct |
| 44 |
Correct |
20 ms |
10164 KB |
Output is correct |
| 45 |
Correct |
24 ms |
10068 KB |
Output is correct |
| 46 |
Correct |
19 ms |
10068 KB |
Output is correct |
| 47 |
Correct |
19 ms |
10068 KB |
Output is correct |
| 48 |
Correct |
19 ms |
10076 KB |
Output is correct |
