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  1.  
  2.  
  3.  
  4. #include <bits/stdc++.h>
  5.  
  6. using namespace std;
  7. typedef long long int ll;
  8. int main(){
  9.  
  10.     ll n;
  11.     cin>>n;
  12.     ll arr[10005];
  13.  
  14.     for(ll i=1;i<=n;i++)
  15.     cin>>arr[i];
  16.  
  17.     ll dp[2][2048];
  18.     for(ll i=0;i<2048;i++)
  19.     dp[0][i]=-1;
  20.  
  21.     dp[0][0]=0;
  22.  
  23.     ll max1=*max_element(arr+1,arr+n+1);
  24.  
  25.     for(ll i=1;i<=n;i++)
  26.     {
  27.         ll it=i&1;
  28.         for(ll j=0;j<(1<<10);j++)
  29.         {
  30.             if(dp[!it][j] != -1)
  31.             dp[it][j^arr[i]]=max(dp[!it][j^arr[i]],dp[!it][j]+1);
  32.             else
  33.             dp[it][j^arr[i]]=dp[!it][j^arr[i]];
  34.         }
  35.     }
  36.  
  37.     ll arr3[1005];
  38.     arr3[0]=1;
  39.     ll mod=pow(10,9)+7;
  40.     for(ll i=1;i<1005;i++)
  41.     arr3[i]=(arr3[i-1]*31)%mod;
  42.  
  43.     ll res=0;
  44.     for(ll i=0;i<=max1;i++)
  45.     {
  46.         res=(res+(arr3[i]*dp[n&1][i])%mod)%mod;
  47.     }
  48.     cout<<res<<endl;
  49.  
  50.         return 0;
  51. }
  52.  
  53.  
Success #stdin #stdout 0s 4332KB
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https://ideone.com/C0kl8a
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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