oj.uz

Submission #1054330

# Submission time Handle Problem Language Result Execution time Memory
1054330 2024-08-12T08:52:03 Z socpite Secret Permutation (RMI19_permutation) C++17
100 / 100
 541 ms 600 KB 
#include "permutation.h"
#include<bits/stdc++.h>
using namespace std;
 
const int maxn = 300;
 
namespace {
	long long D[maxn];
	bool vis[maxn];
	vector<int> crr;
	vector<vector<int>> allans;
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
}
 
bool bt(int pos, int n, const vector<int> &P){
	if(pos > n){
		if(abs(crr.back() - crr[0]) != D[1])return false;
		vector<int> nw(n);
		for(int i = 0; i < n; i++){
			nw[P[i]-1] = crr[i];
		}
		crr = nw;
		return true;
	}
	int tmp = crr.back() + D[pos]; 
	if(tmp <= n && !vis[tmp]){
		crr.push_back(tmp);
		vis[tmp] = 1;
		if(bt(pos+1, n, P))return true;
		vis[tmp] = 0;
		crr.pop_back();
	}
	
	tmp = crr.back() - D[pos]; 
	if(tmp > 0 && !vis[tmp]){
		crr.push_back(tmp);
		vis[tmp] = 1;
		if(bt(pos+1, n, P))return true;
		vis[tmp] = 0;
		crr.pop_back();
	}
	return false;
}
 
void solve(int N) {
	long long sum = 0;
	vector<int> P(N);
	iota(P.begin(), P.end(), 1);
	shuffle(P.begin(), P.end(), rng);
	for(int i = 1; i <= N; i++){
		D[i] = query(P);
		sum += D[i];
		P.push_back(P[0]);
		P.erase(P.begin());
	}
	sum /= N-1;
	for(int i = 1; i <= N; i++){
		D[i] = sum - D[i];
		// cout << D[i] << endl;
	}
	allans.clear();
 
	for(int i = 1; i <= N; i++){
		crr.push_back(i);
		vis[i] = 1;
		if(bt(2, N, P)){
			answer(crr);
			return;
		}
		vis[i] = 0;
		crr.pop_back();
	}
 
}

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 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 344 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 1 ms 344 KB Output is correct
13 Correct 1 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 344 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 1 ms 344 KB Output is correct
13 Correct 1 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 385 ms 344 KB Output is correct
18 Correct 7 ms 344 KB Output is correct
19 Correct 81 ms 444 KB Output is correct
20 Correct 198 ms 344 KB Output is correct
21 Correct 17 ms 448 KB Output is correct
22 Correct 541 ms 600 KB Output is correct
23 Correct 13 ms 344 KB Output is correct
24 Correct 234 ms 344 KB Output is correct
25 Correct 4 ms 448 KB Output is correct
26 Correct 11 ms 344 KB Output is correct