An integer has monotone increasing digits if and only if each pair of adjacent digits x and y satisfy x <= y.
Given an integer n, return the largest number that is less than or equal to n with monotone increasing digits.
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Example 1:
\n\n\nInput: n = 10\nOutput: 9\n\n\n
Example 2:
\n\n\nInput: n = 1234\nOutput: 1234\n\n\n
Example 3:
\n\n\nInput: n = 332\nOutput: 299\n\n\n
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Constraints:
\n\n0 <= n <= 109Compiled with clang 11 using the latest C++ 20 standard.
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Most standard library headers are already included automatically for your convenience.
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