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Submission #1054407

# Submission time Handle Problem Language Result Execution time Memory
1054407 2024-08-12T09:40:34 Z huutuan Secret Permutation (RMI19_permutation) C++14
100 / 100
 1643 ms 680 KB 
#include "permutation.h"

#include <bits/stdc++.h>

using namespace std;

void solve(int n) {
   vector<int> v(n);
   iota(v.begin(), v.end(), 1);
   shuffle(v.begin(), v.end(), mt19937(1));
   vector<int> d1(n);
   for (int i=0; i<n; ++i){
      d1[i]=query(v);
      rotate(v.begin(), v.begin()+1, v.end());
   }
   int sum=accumulate(d1.begin(), d1.end(), 0)/(n-1);
   for (int &i:d1) i=sum-i;
   vector<int> ans(n);
   vector<int> vis(n+1);
   auto backtrack=[&](auto &&self, int i){
      if (i>=n){
         if (abs(ans[n-1]-ans[0])!=d1[0]) return;
         vector<int> res(n);
         for (int i=0; i<n; ++i) res[v[i]-1]=ans[i];
         answer(res);
      }
      int x=ans[i-1]+d1[i];
      if (1<=x && x<=n && !vis[x]){
         vis[x]=1;
         ans[i]=x;
         self(self, i+1);
         vis[x]=0;
      }
      x=ans[i-1]-d1[i];
      if (1<=x && x<=n && !vis[x]){
         vis[x]=1;
         ans[i]=x;
         self(self, i+1);
         vis[x]=0;
      }
   };
   for (int i=1; i<=n; ++i){
      vis[i]=1;
      ans[0]=i;
      backtrack(backtrack, 1);
      vis[i]=0;
   }
}

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 1 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 344 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 1 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 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 1 ms 596 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 ms 416 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 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 1 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 1 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 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 1 ms 596 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 ms 416 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 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 1 ms 344 KB Output is correct
17 Correct 6 ms 440 KB Output is correct
18 Correct 58 ms 600 KB Output is correct
19 Correct 479 ms 344 KB Output is correct
20 Correct 24 ms 344 KB Output is correct
21 Correct 6 ms 344 KB Output is correct
22 Correct 5 ms 440 KB Output is correct
23 Correct 8 ms 440 KB Output is correct
24 Correct 1440 ms 432 KB Output is correct
25 Correct 63 ms 344 KB Output is correct
26 Correct 1643 ms 680 KB Output is correct