CodeForeces 1433A [题目传送门](Problem - 1433A - Codeforces) 题目描述 There is a building consisting of 10 00010 000 apartments numbered from 11 to 10 00010 000, inclusive. Call an apartment boring, if its number consists of the same digit. Examples of boring apartments are 11,2,777,999911,2,777,9999 and so...