正确的写法是位运算~~ 左移即可

#include <bits/stdc++.h>
using namespace std;
#define faster ios::sync_with_stdio(0), cin.tie(0), cout.tie(0)
typedef long long ll; ll n;ll cntl,cnta;const ll N=1e3+5; 
ll a[N]; ll T=1;
void solve(){
	ll l,r;cin>>l>>r;
	ll x=1;
	while(x<=r){
		if(x>=l)cntl++;
		x=x<<1;
	}
	 cout<<cntl;
}
int main(){
	faster;
	while(T--)solve();
	return 0;
}

打表+二分即可

#include <bits/stdc++.h>
using namespace std;
#define faster ios::sync_with_stdio(0), cin.tie(0), cout.tie(0)
typedef long long ll; ll n;
vector<ll>v={1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,131072,262144,524288,1048576,2097152,4194304,8388608,16777216};
ll cntl,cnta,ans; 

void solve(){
	ll r,l;
	cin>>l>>r;
	auto pos_l=lower_bound(v.begin(),v.end(),l); 
	auto pos_r=upper_bound(v.begin(),v.end(),r);
	ll len=pos_r-pos_l;
	cout<<len;
}
int main(){
	faster;
	ll T=1;
	while(T--)solve();
	return 0;
}