Given two integers num and k, consider a set of positive integers with the following properties:
k.num.Return the minimum possible size of such a set, or -1 if no such set exists.
Note:
\n\n0.\n
Example 1:
\n\n\nInput: num = 58, k = 9\nOutput: 2\nExplanation:\nOne valid set is [9,49], as the sum is 58 and each integer has a units digit of 9.\nAnother valid set is [19,39].\nIt can be shown that 2 is the minimum possible size of a valid set.\n\n\n
Example 2:
\n\n\nInput: num = 37, k = 2\nOutput: -1\nExplanation: It is not possible to obtain a sum of 37 using only integers that have a units digit of 2.\n\n\n
Example 3:
\n\n\nInput: num = 0, k = 7\nOutput: 0\nExplanation: The sum of an empty set is considered 0.\n\n\n
\n
Constraints:
\n\n0 <= num <= 30000 <= k <= 9Compiled with clang 11 using the latest C++ 20 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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