Given a positive integer k, you need to find the length of the smallest positive integer n such that n is divisible by k, and n only contains the digit 1.
Return the length of n. If there is no such n, return -1.
Note: n may not fit in a 64-bit signed integer.
\n
Example 1:
\n\n\nInput: k = 1\nOutput: 1\nExplanation: The smallest answer is n = 1, which has length 1.\n\n\n
Example 2:
\n\n\nInput: k = 2\nOutput: -1\nExplanation: There is no such positive integer n divisible by 2.\n\n\n
Example 3:
\n\n\nInput: k = 3\nOutput: 3\nExplanation: The smallest answer is n = 111, which has length 3.\n\n\n
\n
Constraints:
\n\n1 <= k <= 105Compiled with clang 11 using the latest C++ 17 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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