3084. 超级变变变

找规律即可，对于一个确定的k，输出所有的变变数，即可发现规律。
时间复杂度O（logB）

#include<bits/stdc++.h>
#define N 100010
#define inf 2147483647
#define ll long long
#define mem(a,b) memset(a,b,sizeof (a))
#define open(x) freopen(x".in","r",stdin);freopen(x".out","w",stdout);
using namespace std;

ll a,b,ans,k;

ll work(ll x)//0``x
{
	if(x<k)return 0;
	ll s=0,now=k,sum=0;
	if(k&1)s=1;else s=2;
	while(now + s <x)
	{	
		sum+=s;
		now=now*2;
		s=s*2;
	}
	;
	if(now>=x)return sum;
	return sum + x - now +1;
}

int main()
{
	open("chch");
	scanf("%lld%lld%lld",&k,&a,&b);
	if(k>b)
	{
		printf("0");
		return 0;
	}
	if(k==0)
	{
		ans=b-a+1;
	} else if(k==1) ans = b-a+1; else 	//ans=work(b) - work(a-1);
	{
		ans=work(b);
		ll tmp=work(a-1);
		ans-=tmp;
	}
	printf("%lld\n",ans);
	return 0;
}