Algorithms/BIT set/Bit Difference.cpp at c55ce4b125a236decd1607a891ca4b69b78b945e · LakshaySK106/Algorithms · GitHub

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// { Driver Code Starts
//Initial Template for C++

#include<bits/stdc++.h>
using namespace std;


 // } Driver Code Ends
//User function Template for C++

class Solution{
    public:
    // Function to find number of bits needed to be flipped to convert A to B
    int countBitsFlip(int a, int b){

        // Your logic here
        int diff=0;
        if(a<b)
            swap(a,b);
        while(a>0&&b>0)
        {
            if(a%2!=b%2)//if any bit does not matches
            diff++;
            a/=2;
            b/=2;
        }
        while(a>0)// if(still a bits are left)
        {
            if(a%2==1)//a bit is set than only set will different
              diff++;
            a/=2;

        }
        return diff;
    }
};

// { Driver Code Starts.

// Driver Code
int main()
{
	int t;
	cin>>t;// input the testcases
	while(t--) //while testcases exist
	{
		int a,b;
		cin>>a>>b; //input a and b

        Solution ob;
		cout<<ob.countBitsFlip(a, b)<<endl;
	}
	return 0;
}  // } Driver Code Ends