However, the collation would be wrong when the number of digits changed, so leadingzeroes are provided.
不过，如果数字的位数发生了变化，整理就会发生错误，所以要给出前导的零。
2
We don't want decimal numbers with fewer than four digits - excluding leadingzeroes - so that 2992 is the first correct answer.
我们不想十进制数字少于四位数-不含前导零，2992是第一个正确答案。
3
You can translate the resulting mask back into a single index by counting the leadingzeroes, and then subtracting that from 31. A possible assembly language instruction sequence to do this would be