PAT(甲級)1049
The task is simple: given any positive integer N, you are supposed to count the total number of 1's in the decimal form of the integers from 1 to N. For example, given N being 12, there are five 1's in 1, 10, 11, and 12.
Input Specification:
Each input file contains one test case which gives the positive N (<=230
Output Specification:
For each test case, print the number of 1's in one line.
Sample Input:12Sample Output:
5
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