What is the most efficient approach for this?

#1

Simple approach i used :-

#include
using namespace std;

int main()
{
int q;
cin >> q;

while(q–)
{
int a, b;
cin >> a >> b;

   int setBit = 0;
   for(int i = a; i <= b; i++)
   {
       setBit += __builtin_popcount(i);
   }
   cout << setBit << endl;

}
}

#2

hi @devang_11912089
u can go through this https://www.geeksforgeeks.org/count-total-set-bits-in-all-numbers-from-range-l-to-r/ for other optimized methods…

#3

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