二进制枚举

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

int main()
{
    LL n,m;
    cin>>n>>m;
    int num = 0;
    for(int i=1;i<=64;i++)
    {
        for(int j=0;j<i-1;j++)
        {
            LL t = (1ll << i) - 1 -(1LL << j);
            if(t >= n && t <= m)
                num++;
        }
    }
    cout<<num;
    return 0;

}