[AtCoder] Given is an integer N. Find the number of positive integers less than or equal to N that have an odd number of digits (in base ten without leading zeros). - 题解

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题目信息
题号 P14892
标题 [AtCoder] Given is an integer N. Find the number of positive integers less than or equal to N that have an odd number of digits (in base ten without leading zeros).
难度 普及-
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