Doubt regarding my solution

#1

please see into the code .

#2

inside solve function you have to make 3 case
base case if(n==0||n==1)return n%2;
/// no overlap
if(r<s || l >e || s>e)return 0;
in rest case you have to calculate leftans,rightans and also check whether mid lies inside given rang of not if yes then increase ans;

in your code you have use
if(log2(a)==ceil(log2(a)))
{x=ceil(log2(a))+1;}
else x=ceil(log2(a));
to find end index this is not working i have tried this
may be this is not applicable for all
so instead of this you can use a simple function see in the code
you can take help from this code

#3

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