oj.uz

Submission #871433

# Submission time Handle Problem Language Result Execution time Memory
871433 2023-11-10T19:42:26 Z rainboy Secret Permutation (RMI19_permutation) C++17
50 / 100
 880 ms 262144 KB 
#include "permutation.h"
#include <cstring>
#include <vector>
 
using namespace std;
 
typedef vector<int> vi;
 
const int N = 256, M = 262144;
const long long INF = 0x3f3f3f3f3f3f3f3fLL;
 
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;
			}
		}
		long long z_ = INF; int 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])]++;
			long long z = 0;
			for (int a = 0; a < n; a++)
				z += (long long) 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 2476 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 2484 KB Output is correct
5 Correct 0 ms 2484 KB Output is correct
6 Correct 0 ms 2480 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2476 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 2484 KB Output is correct
5 Correct 0 ms 2484 KB Output is correct
6 Correct 0 ms 2480 KB Output is correct
7 Correct 1 ms 2740 KB Output is correct
8 Correct 1 ms 2476 KB Output is correct
9 Correct 1 ms 2484 KB Output is correct
10 Correct 1 ms 2740 KB Output is correct
11 Correct 1 ms 2480 KB Output is correct
12 Correct 1 ms 2484 KB Output is correct
13 Correct 1 ms 2480 KB Output is correct
14 Correct 1 ms 2484 KB Output is correct
15 Correct 1 ms 2740 KB Output is correct
16 Correct 1 ms 2736 KB Output is correct

Subtask #3
0.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2476 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 2484 KB Output is correct
5 Correct 0 ms 2484 KB Output is correct
6 Correct 0 ms 2480 KB Output is correct
7 Correct 1 ms 2740 KB Output is correct
8 Correct 1 ms 2476 KB Output is correct
9 Correct 1 ms 2484 KB Output is correct
10 Correct 1 ms 2740 KB Output is correct
11 Correct 1 ms 2480 KB Output is correct
12 Correct 1 ms 2484 KB Output is correct
13 Correct 1 ms 2480 KB Output is correct
14 Correct 1 ms 2484 KB Output is correct
15 Correct 1 ms 2740 KB Output is correct
16 Correct 1 ms 2736 KB Output is correct
17 Correct 880 ms 196276 KB Output is correct
18 Correct 10 ms 7600 KB Output is correct
19 Correct 545 ms 167600 KB Output is correct
20 Correct 221 ms 105880 KB Output is correct
21 Runtime error 550 ms 262144 KB Execution killed with signal 9
22 Halted 0 ms 0 KB -