oj.uz

Submission #802346

# Submission time Handle Problem Language Result Execution time Memory
802346 2023-08-02T11:46:31 Z Sohsoh84 Giraffes (JOI22_giraffes) C++17
59 / 100
 6666 ms 91484 KB 
// Wounds should become scars but I'm cracked instead U+1FAE0
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

#define all(x)			(x).begin(),(x).end()
#define X			first
#define Y			second
#define sep			' '
#define endl			'\n'
#define debug(x)		cerr << #x << ": " <<  x << endl;

const ll MAXN = 500 + 10;
const ll TMAX = 1e6 + 10;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int dp[MAXN][MAXN][MAXN], n, P[TMAX], ind[TMAX];

inline int rand_perm() {
	int l = 1, r = n;
	int fl = 1, fr = n;
	int ans = n;

	for (int i = 1; i <= n; i++) {
		if (P[l] == fl) {
			ans--;
			l++;
			fl++;
		} else if (P[l] == fr) {
			ans--;
			l++;
			fr--;
		} else if (P[r] == fl) {
			ans--;
			r--;
			fl++;
		} else if (P[r] == fr) {
			ans--;
			r--;
			fr--;
		} else {
			int tfl = fl;
			int tfr = fr;

			/*if (ind[fl] < l || ind[fl] > r) tfl++;
			else if (ind[fr] < l || ind[fr] > r) tfr--;
			else*/ if (rng() % 2) tfl++;
			else tfr--;

			if (P[l] < fl || P[l] > fr) l++;
			else if (P[r] < fl || P[r] > fr) r--;
			else if (rng() % 2) l++;
			else r--;

			fl = tfl;
			fr = tfr;
		}
	}

	return ans;
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> P[i];
		ind[P[i]] = i;
	}

	if (n < MAXN) {
		for (int len = 1; len <= n; len++) {
			for (int l = 1; l <= n - len + 1; l++) {
				for (int tl = 1; tl <= n - len + 1; tl++) {
					int r = l + len - 1;
					int tr = tl + len - 1;

					if (P[l] == tl) dp[len][l][tl] = dp[len - 1][l + 1][tl + 1] + 1;
					else if (P[r] == tl) dp[len][l][tl] = dp[len - 1][l][tl + 1] + 1;
					else if (P[l] == tr) dp[len][l][tl] = dp[len - 1][l + 1][tl] + 1;
					else if (P[r] == tr) dp[len][l][tl] = dp[len - 1][l][tl] + 1;
					else dp[len][l][tl] = max({
							dp[len - 1][l][tl], 
							dp[len - 1][l + 1][tl], 
							dp[len - 1][l][tl + 1], 
							dp[len - 1][l + 1][tl + 1]
							});
				}
			}
		}

		cout << n - dp[n][1][1] << endl;
	} else {
		int fuck = 10000000 * 25 / n;

		int ans = n;
		while (fuck--) {
			ans = min(ans, rand_perm());
		}

		cout << ans << endl;
	}

	return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 0 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 0 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 0 ms 468 KB Output is correct
18 Correct 0 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 0 ms 468 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 0 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 0 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 0 ms 468 KB Output is correct
18 Correct 0 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 0 ms 468 KB Output is correct
21 Correct 1 ms 1236 KB Output is correct
22 Correct 6 ms 9812 KB Output is correct
23 Correct 21 ms 35284 KB Output is correct
24 Correct 37 ms 59896 KB Output is correct
25 Correct 54 ms 85036 KB Output is correct
26 Correct 49 ms 89184 KB Output is correct
27 Correct 50 ms 89724 KB Output is correct
28 Correct 50 ms 90280 KB Output is correct
29 Correct 49 ms 90940 KB Output is correct
30 Correct 52 ms 91484 KB Output is correct

Subtask #4
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 0 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 0 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 0 ms 468 KB Output is correct
18 Correct 0 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 0 ms 468 KB Output is correct
21 Correct 1 ms 1236 KB Output is correct
22 Correct 6 ms 9812 KB Output is correct
23 Correct 21 ms 35284 KB Output is correct
24 Correct 37 ms 59896 KB Output is correct
25 Correct 54 ms 85036 KB Output is correct
26 Correct 49 ms 89184 KB Output is correct
27 Correct 50 ms 89724 KB Output is correct
28 Correct 50 ms 90280 KB Output is correct
29 Correct 49 ms 90940 KB Output is correct
30 Correct 52 ms 91484 KB Output is correct
31 Incorrect 6666 ms 348 KB Output isn't correct
32 Halted 0 ms 0 KB -