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 页用数字6 表示，而不是06 或006 等。数

字计数问题要求对给定书的总页码n，计算出书的全部页码中分别用到多少次数字0，1，

2，…，9。-Pages of a book starting from the natural number 1 until the natural number sequence encoding n. Book page layout in accordance with common practice, each page do not contain extra leading digit 0. For example, on page 6 with the number 6 that, rather than 06 or 006 and so on. Digital counting problem requires the total page number given the book n, calculate the total page number in the book were how many times the number used in 0,1, 2, ..., 9.