oj.uz

Submission #871429

# Submission time Handle Problem Language Result Execution time Memory
871429 2023-11-10T19:28:44 Z rainboy Secret Permutation (RMI19_permutation) C++17
50 / 100
 5000 ms 97800 KB 
#include "permutation.h"
#include <cstring>
#include <vector>

using namespace std;

typedef vector<int> vi;

const int N = 256, M = 50000, INF = 0x3f3f3f3f;

int abs_(int a) { return a > 0 ? a : -a; }
int min(int a, int b) { return a < b ? a : b; }

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

char used[N]; int kk[N];

int check(int *aa, int n, int m) {
	int a = 0;
	for (int i = 0; i < m; i++)
		a = min(a, aa[i]);
	memset(used, 0, n * sizeof *used);
	for (int i = 0; i < m; i++) {
		if (aa[i] - a >= n || used[aa[i] - a])
			return 0;
		used[aa[i] - a] = 1;
	}
	return 1;
}

int rr[N], dd[N], aaa[M][N], aaa_[M][N], m, m_;

void solve(int n) {
	for (int i = 0; i < n; i++)
		rr[i] = i;
	for (int i = 0; i < n; i++) {
		int j = rand_() % (i + 1), tmp;
		tmp = rr[i], rr[i] = rr[j], rr[j] = tmp;
	}
	vi ii(n);
	for (int i = 0; i < n; i++) {
		for (int h = 0; h < n; h++)
			ii[h] = rr[(i + h) % n] + 1;
		dd[i] = query(ii);
	}
	int sum = 0;
	for (int i = 0; i < n; i++)
		sum += dd[i];
	sum /= n - 1;
	for (int i = 0; i < n; i++)
		dd[i] = sum - dd[i];
	vi aa(n), aa_(n);
	int m = 0;
	aaa[m][0] = 0, aaa[m][1] = dd[1], m++;
	int j = 2;
	while (1) {
		while (j < n) {
			m_ = 0;
			for (int h = 0; h < m; h++) {
				memcpy(aaa_[m_], aaa[h], j * sizeof *aaa[h]), aaa_[m_][j] = aaa[h][j - 1] + dd[j];
				if (check(aaa_[m_], n, j + 1))
					m_++;
				if (m_ >= M)
					goto out;
				memcpy(aaa_[m_], aaa[h], j * sizeof *aaa[h]), aaa_[m_][j] = aaa[h][j - 1] - dd[j];
				if (check(aaa_[m_], n, j + 1))
					m_++;
				if (m_ >= M)
					goto out;
			}
			m = m_;
			for (int h = 0; h < m_; h++)
				memcpy(aaa[h], aaa_[h], (j + 1) * sizeof *aaa_[h]);
			j++;
		}
out:
		if (j == n) {
			m_ = 0;
			for (int h = 0; h < m; h++)
				if (abs_(aaa[h][n - 1]) == dd[0])
					memcpy(aaa_[m_++], aaa[h], n * sizeof *aaa[h]);
			m = m_;
			for (int h = 0; h < m_; h++)
				memcpy(aaa[h], aaa_[h], n * sizeof *aaa_[h]);
			if (m == 1) {
				for (int i = 0; i < n; i++)
					aa[i] = aaa[0][i];
				break;
			}
		}
		int z_ = INF, i_ = -1;
		for (int i = 0; i < j; i++) {
			memset(kk, 0, n * sizeof *kk);
			for (int h = 0; h < m; h++)
				kk[abs_(aaa[h][i])]++;
			int z = 0;
			for (int a = 0; a < n; a++)
				z += kk[a] * kk[a];
			if (z_ > z)
				z_ = z, i_ = i;
		}
		for (int h = 0; h < n; h++)
			ii[h] = rr[h < i_ ? i_ - 1 - h : h] + 1;
		int a = query(ii) - (sum - dd[0]) + dd[i_];
		m_ = 0;
		for (int h = 0; h < m; h++)
			if (abs_(aaa[h][i_]) == a)
				memcpy(aaa_[m_++], aaa[h], n * sizeof *aaa[h]);
		m = m_;
		for (int h = 0; h < m_; h++)
			memcpy(aaa[h], aaa_[h], n * sizeof *aaa_[h]);
	}
	int a = 0;
	for (int i = 0; i < n; i++)
		a = min(a, aa[i]);
	for (int i = 0; i < n; i++)
		aa[i] -= a - 1;
	for (int i = 0; i < n; i++)
		aa_[rr[i]] = aa[i];
	for (int i = 0; i < n; i++)
		aa[i] = aa_[i];
	answer(aa);
}

Compilation message

stub.cpp: In function 'int query(int*)':
stub.cpp:15:9: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   fscanf(stdin, "%d", &x);
      |   ~~~~~~^~~~~~~~~~~~~~~~~
stub.cpp: In function 'int main(int, char**)':
stub.cpp:48:9: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |   fscanf(stdin, "%d", &N);
      |   ~~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2484 KB Output is correct
2 Correct 0 ms 2484 KB Output is correct
3 Correct 0 ms 2484 KB Output is correct
4 Correct 0 ms 2648 KB Output is correct
5 Correct 0 ms 2480 KB Output is correct
6 Correct 0 ms 2484 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2484 KB Output is correct
2 Correct 0 ms 2484 KB Output is correct
3 Correct 0 ms 2484 KB Output is correct
4 Correct 0 ms 2648 KB Output is correct
5 Correct 0 ms 2480 KB Output is correct
6 Correct 0 ms 2484 KB Output is correct
7 Correct 1 ms 4952 KB Output is correct
8 Correct 1 ms 2480 KB Output is correct
9 Correct 1 ms 2488 KB Output is correct
10 Correct 1 ms 4788 KB Output is correct
11 Correct 1 ms 2484 KB Output is correct
12 Correct 1 ms 4524 KB Output is correct
13 Correct 1 ms 2484 KB Output is correct
14 Correct 1 ms 2480 KB Output is correct
15 Correct 1 ms 4788 KB Output is correct
16 Correct 1 ms 4792 KB Output is correct

Subtask #3
0.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2484 KB Output is correct
2 Correct 0 ms 2484 KB Output is correct
3 Correct 0 ms 2484 KB Output is correct
4 Correct 0 ms 2648 KB Output is correct
5 Correct 0 ms 2480 KB Output is correct
6 Correct 0 ms 2484 KB Output is correct
7 Correct 1 ms 4952 KB Output is correct
8 Correct 1 ms 2480 KB Output is correct
9 Correct 1 ms 2488 KB Output is correct
10 Correct 1 ms 4788 KB Output is correct
11 Correct 1 ms 2484 KB Output is correct
12 Correct 1 ms 4524 KB Output is correct
13 Correct 1 ms 2484 KB Output is correct
14 Correct 1 ms 2480 KB Output is correct
15 Correct 1 ms 4788 KB Output is correct
16 Correct 1 ms 4792 KB Output is correct
17 Partially correct 247 ms 97800 KB Partially correct
18 Correct 10 ms 7608 KB Output is correct
19 Partially correct 196 ms 89536 KB Partially correct
20 Partially correct 88 ms 85484 KB Partially correct
21 Partially correct 105 ms 89528 KB Partially correct
22 Execution timed out 5004 ms 97708 KB Time limit exceeded
23 Halted 0 ms 0 KB -