c++ easy approach
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```cpp []
class Solution {
public:
    int minChanges(int n, int k) {
        
        int cnt = 0;
        
        for(int i=0; i<30; i++) {
            if(k & (1<<i)) {
                if(!(n&(1<<i))) {
                    return -1;
                }
            }
            else {
                if(n&(1<<i)) cnt++;
            }
        }
        
        return cnt;
    }
};
```
['C++']