Submission #1357260

#	Time	Username	Problem	Language	Result	Execution time	Memory
1357260		kawhiet	Money (IZhO17_money)	C++20	25 / 100	51 ms	452 KiB

money

#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define dbg(...) 47
#endif



int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    assert(n <= 20);
    int ans = n;
    for (int s = 0; s < (1 << n); s++) {
        if (!(s & (1 << (n - 1)))) continue;
        bool ok = true;
        vector<int> b = {0, (int)1e9};
        vector<int> c;
        for (int i = 0; i < n; i++) {
            c.push_back(a[i]);
            if (s & (1 << i)) {
                if (!ranges::is_sorted(c)) {
                    ok = false;
                    break;
                }
                int x = c[0], y = c.back();
                bool found = false;
                for (int i = 1; i < b.size(); i++) {
                    if (b[i - 1] <= x && y <= b[i]) {
                        found = true;
                        b.insert(b.begin() + i, c.begin(), c.end());
                        break;
                    }
                }
                if (!found) {
                    ok = false;
                    break;
                }
                c.clear();
            }
        }
        if (ok) {
            ans = min(ans, __builtin_popcount(s));
        }
    }
    cout << ans << '\n';
    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55