Submission #831722

#	Time	Username	Problem	Language	Result	Execution time	Memory
831722		Chal1shkan	Money (IZhO17_money)	C++14	100 / 100	157 ms	22748 KiB

money

//Bismillahir-Rahmanir-Rahim
 
# include <bits/stdc++.h>
 
# define pb push_back
# define ff first
# define ss second
# define nl "\n"
# define sz(x) ((int)(x).size())
# define all(x) (x).begin(), (x).end()
# define deb(x) cerr << #x  << " = " << x << endl; 
# define pll pair <ll, ll>
# define pii pair <int, int>
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
 
const ll maxn = 1e6 + 7;
const ll inf = 2e18 + 0;
const ll mod = 1e9 + 7;
const ll dx[] = {-1, 1, 0, 0};
const ll dy[] = {0, 0, -1, 1};
 
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
struct fenwick {
	ll ft[maxn];
	void upd (ll id, ll x) {
		for (; id < maxn; id += (id & -id)) {
			ft[id] += x;
		}
	}
	ll get (ll id) {
		ll res = 0;
		for (; id > 0; id -= (id & -id)) {
			res += ft[id];
		}
		return res;
	}
	ll get (ll l, ll r) {
      if (l > r) return 0;
		return get(r) - get(l - 1);
	}
} st;
 
void ma1n (/* SABR */) {
	ll n;
	cin >> n;
	ll a[n + 3];
	for (ll i = 1; i <= n; ++i) {
		cin >> a[i];
	}
	ll ans = 0;
	for (ll i = 1; i <= n; ++i) {
		ll j = i;
		while (1) {
			if (j + 1 > n) break;
			if (a[j] > a[j + 1]) break;
			if (st.get(a[i] + 1, a[j + 1] - 1)) break;
			++j;
		}
		ans++;
		for (ll k = i; k <= j; ++k) st.upd(a[k], 1);
		i = j;
	}
	cout << ans << nl;
}
 
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
//  freopen("file.in", "r", stdin);
//  freopen("file.out", "w", stdout);
    int ttt = 1;
//  cin >> ttt;
    for (int test = 1; test <= ttt; ++test) {
//      cout << "Case " << test << ":" << '\n';
        ma1n();
    }
    return 0;
}
 
// 998batrr | BbIWEJI 3A TObOU!!!
// tourist  | BbIWEJI 3A TObOU!!!

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55