Submission #685449

#TimeUsernameProblemLanguageResultExecution timeMemory
685449dranaya_dushaSecret Permutation (RMI19_permutation)C++17
0 / 100
1 ms336 KiB
//#pragma GCC optimize ("Ofast") #include <bits/stdc++.h> ////#define int long long //#define mp make_pair //#define pb push_back //#define fi first //#define se second //#define pii pair <int, int> #include "permutation.h" using namespace std; vector<int> ans; vector<int> used; bool check (vector<int> &q, vector<int> &v, int p, int n) { used[ans[v[p]-1]]=1; if (p==n-1 && abs(ans[v[p]-1] - ans[v[0]-1] ) == q[n-1]) { answer(ans); exit(0); } else{ if (ans[v[p]-1]+q[p]<=n && !used[ans[v[p]-1]+q[p]]){ ans[v[p+1]-1]=ans[v[p]-1]+q[p]; // used[ans[v[p]-1]+q[i]]=1; check(q, v, p+1, n); } else if (ans[v[p]-1]-q[p]>0 && !used[ans[v[p]-1]-q[p]]) { ans[v[p+1]-1]=ans[v[p]-1]-q[p]; check(q, v, p+1, n); // used[ans[v[p]-1]-q[p]]=1; } used[ans[v[p]-1]]=0; ans[v[p]-1]=0; } } void solve(int n) { vector<int> v; for (int i=1; i<=n; i++) v.push_back(i); srand(time(NULL)); random_shuffle(v.begin(), v.end()); vector<int> q(n); for(int i=0;i<n;i++){ rotate(v.begin(),v.begin()+1,v.end()); q[i] = query(v); } // for (int i=0; i<n; i++) // cout << q[i] << ' '; rotate(v.begin(),v.begin()+1,v.end()); int sum=0; for(int i=0;i<n;i++){ sum+=q[i]; } sum/=(n-1); for(int i=0;i<n;i++) q[i]=(sum-q[i]); rotate(q.begin(),q.begin()+1,q.end()); ans.assign(n, 0); // for (int i=0; i<n; i++) // cout << q[i] << ' '; // cout << endl; // for (int i=0; i<n; i++) // cout << v[i] << ' '; // cout << endl; for (int i=1; i<=n; i++) { used.assign(n+1, 0); ans.assign(n, 0); ans[v[0]-1]=i; check(q, v, 0, n); } }

Compilation message (stderr)

permutation.cpp: In function 'bool check(std::vector<int>&, std::vector<int>&, int, int)':
permutation.cpp:36:20: warning: control reaches end of non-void function [-Wreturn-type]
   36 |         ans[v[p]-1]=0;
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);
      |   ~~~~~~^~~~~~~~~~~~~~~~~
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