借鉴了榜二的思路，很赞
排列与二进制
https://www.nowcoder.com/practice/647fc23dc4e147328cc484e3aeb6cc2a
#include <stdio.h>
int main(){
int n,m,a[100];
while(scanf("%d%d",&n,&m)!=EOF){
if(n==0)return 0;
int sum=0;
for(int i=n-m+1;i<=n;i++){
int k=i;
while(k%2==0){
k/=2;
sum++;
}
}
printf("%d\n",sum);
}
return 0;
}
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