Submission #1064619

#	Time	Username	Problem	Language	Result	Execution time	Memory
1064619		aufan	Money (IZhO17_money)	C++17	100 / 100	147 ms	30680 KiB

money

#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second

using namespace std;

int32_t main()
{
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        
        int n;
        cin >> n;

        vector<int> a(n + 1);
        for (int i = 1; i <= n; i++) cin >> a[i];

        vector<int> fen(1000001);
        
        auto upd = [&](int x, int val) {
                for (; x <= 1000000; x += x & -x) fen[x] += val;
        };

        auto qry = [&](int x) {
                int res = 0;
                for (; x > 0; x -= x & -x) res += fen[x];
                return res;
        };

        int j = 1;
        vector<int> dp(n + 1);
        for (int i = 1; i <= n; i++) {
                if (a[i] < a[i - 1]) {
                        while (j < i) {
                                upd(a[j++], 1);
                        }
                }

                while (j < i && qry(a[i] - 1) - qry(a[j]) > 0) {
                        upd(a[j++], 1);
                }

                dp[i] = dp[j - 1] + 1;
        }

        cout << dp[n] << '\n';
        
        return 0;
}

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