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Submission #1054221

# Submission time Handle Problem Language Result Execution time Memory
1054221 2024-08-12T07:44:17 Z socpite Secret Permutation (RMI19_permutation) C++17
27.5 / 100
 5000 ms 344 KB 
#include "permutation.h"
#include<bits/stdc++.h>
using namespace std;

const int maxn = 300;

namespace {
	int n;
	long long D[maxn];
	bool vis[maxn];
	vector<int> crr;
	vector<vector<int>> allans;
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	int prv(int x){
		return x == 0 ? n-1 : x-1;
	}
	int nxt(int x){
		return x == n-1 ? 0 : x+1;
	}
}

void bt(int l, int r){
	if(nxt(r) == l){
		if(abs(crr[l] - crr[r]) != D[l])return;
		allans.push_back(crr);
		return;
	}
	int pr = nxt(r);
	int op1 = crr[r] + D[pr], op2 = crr[r] - D[pr]; 
	if(op1 > n || vis[op1]){
		if(op2 < 1 || vis[op2])return;
		vis[op2] = 1;
		crr[pr] = op2;
		bt(l, pr);
		vis[op2] = 0;
	}
	else if(op2 < 1 || vis[op2]){
		vis[op1] = 1;
		crr[pr] = op1;
		bt(l, pr);
		vis[op1] = 0;
	}
	else {
		int pl = prv(l);
		op1 = crr[l] + D[l], op2 = crr[l] - D[l];
		if(op1 <= n && !vis[op1]){
			crr[pl] = op1;
			vis[op1] = 1;
			bt(pl, r);
			vis[op1] = 0;
		}
		if(op2 >= 1 && !vis[op2]){
			crr[pl] = op2;
			vis[op2] = 1;
			bt(pl, r);
			vis[op2] = 0;
		}
	}
	
}

void solve(int N) {
	n = N;
	long long sum = 0;
	vector<int> P(N);
	crr.resize(N, 0);
	iota(P.begin(), P.end(), 1);
	// shuffle(P.begin(), P.end(), rng);
	for(int i = 0; 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 = 0; i < N; i++){
		D[i] = sum - D[i];
		// cout << D[i] << endl;
	}
	allans.clear();

	for(int i = 1; i <= N; i++){
		crr[0] = i;
		vis[i] = 1;
		bt(0, 0);
		vis[i] = 0;
	}
	while(allans.size() > 2){
		shuffle(P.begin(), P.end(), rng);
		vector<vector<int>> nw;
		int chksum = query(P);
		for(auto vec: allans){
			int csum = 0;
			for(int i = 1; i < N; i++)csum += abs(vec[P[i]-1] - vec[P[i-1]-1]);
			if(csum == chksum)nw.push_back(vec);
		}
		allans = nw;
	}
	answer(allans.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
8.25 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Partially correct 0 ms 344 KB Partially correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct

Subtask #2
19.25 / 35.0

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

Subtask #3
0.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Partially correct 0 ms 344 KB Partially correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 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 0 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 173 ms 344 KB Output is correct
18 Correct 26 ms 344 KB Output is correct
19 Execution timed out 5062 ms 344 KB Time limit exceeded
20 Halted 0 ms 0 KB -