Submission #831719

#	Time	Username	Problem	Language	Result	Execution time	Memory
831719		Chal1shkan	Money (IZhO17_money)	C++14	0 / 100	3 ms	4180 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 FenwickTree {
    vector<int> bit;  // binary indexed tree
    int n;

    FenwickTree(int n) {
        this->n = n;
        bit.assign(n, 0);
    }

    FenwickTree(vector<int> const &a) : FenwickTree(a.size()) {
        for (size_t i = 0; i < a.size(); i++)
            add(i, a[i]);
    }

    int sum(int r) {
        int ret = 0;
        for (; r >= 0; r = (r & (r + 1)) - 1)
            ret += bit[r];
        return ret;
    }

    int sum(int l, int r) {
        return sum(r) - sum(l - 1);
    }

    void add(int idx, int delta) {
        for (; idx < n; idx = idx | (idx + 1))
            bit[idx] += delta;
    }
};
 
void ma1n (/* SABR */) {
	FenwickTree st(1000000);
	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.sum(a[i] + 1, a[j + 1] - 1)) break;
			++j;
		}
		ans++;
		for (ll k = i; k <= j; ++k) st.add(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: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55