Playing with Bits

#1

can someone tell the approach to this problem

#2

hi @akshat42bajpai
u can simply perform a brute force method… refer this code -->

#include<iostream>
using namespace std;
int main(){
	
	int t;
	cin>>t;
	for(int i=0;i<t;i++){
        int a,b;
        cin>>a>>b;
        
        int count = 0;
        for(int j=a;j<=b;j++){
            int num = j;
                
            while(num>0){
                int rem = num%2;
                if(rem == 1){
                    count++;
                }
                num=num/2;
            }
        }
        cout<<count<<endl;
	}
}
#3

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