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  1. // Online C++ compiler to run C++ program online
  2. #include <iostream>
  3. #include <vector>
  4. #include <cmath>
  5. using namespace std ;
  6. class Solution 
  7. {
  8. public:
  9.     int maxOR; 
  10.     int Count;
  11.  
  12.     void solve(const vector<int>& nums, int index, int currentOR)
  13.     {
  14.         if (index >= nums.size()) {
  15.             if (currentOR == maxOR)   
  16.                 Count++;
  17.             return;
  18.         }
  19.         // take
  20.         solve(nums, index + 1, currentOR | nums[index]);
  21.         // leave
  22.         solve(nums, index + 1, currentOR);
  23.     }
  24.  
  25.     int countMaxOrSubsets(vector<int>& nums)
  26.     {
  27.         maxOR = 0;
  28.         Count = 0;
  29.  
  30.         for (int num : nums)
  31.             maxOR |= num;
  32.  
  33.         solve(nums, 0, 0);
  34.  
  35.         return Count;
  36.     }
  37. };
  38.  
  39. int main() {
  40.     Solution sol;
  41.     vector<int> nums = {2,2,2};
  42.     cout << "Count of max OR subsets: " << sol.countMaxOrSubsets(nums) << endl;
  43.     return 0;
  44. }
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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Count of max OR subsets: 7
https://ideone.com/7u8LsG
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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