一本书的页码从自然数1开始顺序编码直到自然数n。书的页码按照通常的习惯编排，每个页码都不含多余的前导数字0。例如第6页用6表示而不是06或006。数字统计问题要求对给定书的总页码，计算出书的全部页码中分别用到多少次数字0,1,2,3,.....9。-A book page from the coding sequence of natural numbers starting at 1 until the natural number n. Book page layout according to the usual habits of each page are free of extra leading digit 0. E.g., page 6 represented by six instead of 06 or 006. Digital statistical problem calls for a given total number of pages of the book, calculate all the pages of the book many times, respectively, used in digital 0,1,2,3, ..... 9.