///////////////////////////////////////////////////////////////////////////////////////////////
#include <bits/stdc++.h>
using namespace std;
// #define int long long
#define FAST_IO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define FILE_IO(x) freopen((string(x) + ".in").c_str(), "r", stdin); freopen((string(x) + ".out").c_str(), "w", stdout)
#define f first
#define s second
#define x1 x1qwer
#define y1 y1qwer
#define right right123
#define left left123
#define foreach(it, v) for (auto it : v)
#define rep(it, n) for (int it = 0; it < n; ++it)
#define forin(it, l, r) for (int it = l; it < r; ++it)
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef unsigned long long ull;
typedef double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const double DINF = numeric_limits<double>::infinity();
const ll MOD = 1e9 + 7;
const double EPS = 1e-7;
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
mt19937 mmtw_(MOD);
uniform_int_distribution<ll> rd_;
ll randomll() { return rd_(mmtw_);}
ll rnd(ll x, ll y) { return rd_(mmtw_) % (y - x + 1) + x; }
template <class T> T fact(T n) { if (n == 1) return 1; return n * fact(n - 1); }
////////////////////////////////////////////////////////////////////////////////////////////////
const int MAXN = 1e6 + 5;
int n;
int a;
int arrow[MAXN];
int main() {
FAST_IO;
cin >> n;
int res = 0;
rep(i, n) {
cin >> a;
if (!arrow[a]) {
res++;
arrow[a]++;
}
arrow[a]--;
arrow[a - 1]++;
}
cout << res << endl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
3 ms |
376 KB |
Output is correct |
| 3 |
Correct |
3 ms |
404 KB |
Output is correct |
| 4 |
Correct |
3 ms |
624 KB |
Output is correct |
| 5 |
Correct |
112 ms |
4216 KB |
Output is correct |
| 6 |
Correct |
84 ms |
7768 KB |
Output is correct |
| 7 |
Correct |
154 ms |
10684 KB |
Output is correct |
| 8 |
Correct |
76 ms |
13544 KB |
Output is correct |
| 9 |
Correct |
90 ms |
16624 KB |
Output is correct |
| 10 |
Correct |
89 ms |
19928 KB |
Output is correct |
