摘要： 题意:There is sequence 1, 12, 123, 1234, ..., 12345678910, ... . Now you are given two integers A and B, you have to find the number of integers from Ath number to Bth (inclusive) number, which are divisible by 3.For example, let A = 3. B = 5. So, the numbers in the sequence are, 123, 1234, 12345. And 阅读全文