이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
/*
Code written by Talant I.D.
*/
#include <bits/stdc++.h>
//~ #include <ext/pb_ds/assoc_container.hpp>
//~ using namespace __gnu_pbds;
using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
//~ typedef tree <int, null_type, less_equal <int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
//~ #define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
const ll mod = 1e9+7;
ll mode(ll a) {
while (a < 0) {
a += mod;
}
return a % mod;
}
ll subt(ll a, ll b) {
return mode(mode(a)-mode(b));
}
ll add(ll a, ll b) {
return mode(mode(a)+mode(b));
}
ll mult(ll a, ll b) {
return mode(mode(a)*mode(b));
}
ll binpow(ll a, ll b) {
ll res = 1;
while (b) {
if (b&1) res = mult(res, a);
a = mult(a, a);
b >>= 1;
}
return res;
}
int main() {
do_not_disturb
int n;
cin >> n;
vector <ll> a(n), b(n-1), L(n-1), R(n-1);
for (auto &to : a) cin >> to;
for (int i = 0; i < n-1; i++) {
b[i] = a[i+1]-a[i];
}
L[0] = max(1-b[0], 0ll);
R[n-2] = max(1+b[n-2], 0ll);
for (int i = 1; i < n-1; i++) {
L[i] = L[i-1]+max(1-b[i], 0ll);
}
for (int i = n-3; i >= 0; i--) {
R[i] = R[i+1]+max(1+b[i], 0ll);
}
ll ans = min(L[n-2], R[0]);
for (int i = 0; i < n-2; i++) {
ans = min(ans, max(L[i], R[i+1]));
}
cout << ans;
return 0;
}
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