Submission #764183

#	Time	Username	Problem	Language	Result	Execution time	Memory
764183		vjudge1	Exam (eJOI20_exam)	C++14	14 / 100	1088 ms	295336 KiB

exam

//srand(time(0)) - always changing
//order_of_key(k): Number of items strictly smaller than k .
//find_by_order(k): K-th element in a set (counting from zero).
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>

using namespace std;

int n, ans = 0;
vector <int> a, b;
map <vector <int>, bool> was;

void rec(vector <int> a) {
	if (was[a]) return;
	else was[a] = 1;
	for (int i = 0; i < n - 1; i++) {
		int mn = a[i];
		int mx = a[i];
		for (int j = i + 1; j < n; j++) {
			mn = min(mn, a[j]);
			mx = max(mx, a[j]);
			if (mn < mx) {
				vector <int> act = a;
				for (int k = i; k <= j; k++) {
					act[k] = mx;
				}
				rec(act);
			}
		}
	}
	int cnt = 0;
	for (int i = 0; i < n; i++) {
		if (a[i] == b[i]) cnt++;
	}
	ans = max(ans, cnt);
}

void solve() {
	bool sub1 = true;
	cin >> n;
	for (int i = 1; i <= n; i++) {
		int x;
		cin >> x;
		a.push_back(x);
	}
	for (int i = 1; i <= n; i++) {
		int x;
		cin >> x;
		b.push_back(x);
		if (i > 1) {
			if (b[i - 1] != b[i - 2]) sub1 = false;
		}
	}
	if (sub1) {
		int cnt = 0;
		for (int i = 0; i < n; i++) {
			if (a[i] != b[i]) continue;
			cnt++;
			for (int j = i - 1; j >= 0; j++) {
				if (a[j] >= a[i]) break;
				a[j] = a[i];
				cnt++;
			}
			for (int j = i + 1; j < n; j++) {
				if (a[j] >= a[i]) break;
				a[j] = a[i];
				cnt++;
			}
		}
		
		cout << cnt;
		return;
	}
	rec(a);
	cout << ans;
}

const bool Cases = 0;

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int TT = 1;
	if (Cases) cin >> TT;
	while (TT--) {
		solve();
	}
}

• Subtask 1: 14 / 14
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 16
• Subtask 6: 0 / 22