Twitter OA prepare: Two Operations


Twitter OA prepare: Two Operations


分析:这道题就是看这个二进制数most significant bit的1左移了多少位,即是所需的乘2次数;然后除开Most Significant bit的这个1之后的其它1的个数,就是需要加1的次数
比如15,1111,most significant bit的1是左移三位得到的,所以需要乘2三次,剩下111三个1,所以需要加1 三次,总操作3+3+1=7次。
 6 public static int shortest(int target) {
 7         if (target < 1) {
 8             return -1;
 9         }
10         int count = 1;
11         while (target != 1) {
12             if (target % 2 == 0) {
13                 target /= 2;
14             } else {
15                 target -= 1;
16             }
17             count ++;
18         }
19         return count;
20 }
Twitter OA prepare: Two Operations

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