fork download
copy 
  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4. #include <string>
  5. #include <set>
  6. #include <cstring>
  7.  
  8. #define pb push_back
  9. using namespace std;
  10.  
  11. int bitsize(long long n)
  12. {
  13.     int c=0;
  14.     while(n) n>>=1, c++;
  15.     return c;
  16. }
  17.  
  18. int main() {
  19.     ios_base::sync_with_stdio(0);
  20. 	long long n,x,i,ans,t;
  21. 	cin>>n;
  22. 	set<long long,greater<long long>>s,w;
  23.  
  24. 	for(i=0;i<n;i++) cin>>x, s.insert(x);
  25. 	//gaussian elimination method
  26. 	while(!s.empty())
  27. 	{
  28. 	    long long m=*s.begin();
  29. 	    w.insert(m);
  30. 	    s.erase(m);
  31. 	    int sz=bitsize(m)-1;
  32. 	    for(auto i:s)
  33. 	    {
  34. 	        long long x=i;
  35. 	        if((i>>sz)&1)
  36. 	        {
  37. 	            s.erase(x);
  38. 	            s.insert(x^m);
  39. 	        }
  40. 	    }
  41. 	}
  42.  
  43. 	ans=0;
  44. 	for(auto i:w) ans=max(ans,ans^i);
  45. 	cout<<ans;
  46.  
  47. 	return 0;
  48. }
  49.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
copy 
3
1
2
3
stdout
copy 
3
https://ideone.com/UbRCH9
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!