This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define F first
#define S second
#define PB push_back
#define PF push_front
#define MP make_pair
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
const int maxn = 1e3 + 10;
const int mod = 1e9 + 7;
int a[maxn], b[maxn], par[maxn];
int main() {
srand (time (NULL));
int n;
cin >> n;
int M = 0;
for (int i = 1; i <= n; i++) {
cin >> a[i];
M = max (M, a[i]);
b[i] = 1;
par[i] = 1;
}
if (M == 1)
return cout << 1 << endl, 0;
int cnt = 1;
bool eq = false;
while (!eq) {
cnt ++;
for (int i = n; i >= 1; i--) {
if (b[i] != par[i - 1] + 1) {
b[i] ++;
par[i] = max (par[i], b[i]);
for (int j = i + 1; j <= n; j++) {
par[j] = par[j - 1];
b[j] = 1;
}
break;
}
}
eq = true;
for (int i = 1; i <= n; i++)
if (a[i] != b[i])
eq = false;
}
cout << cnt << endl;
}
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