Given an array of positive integers arr (not necessarily distinct), return the lexicographically largest permutation that is smaller than arr, that can be made with exactly one swap. If it cannot be done, then return the same array.
Note that a swap exchanges the positions of two numbers arr[i] and arr[j]
\n
Example 1:
\n\n\nInput: arr = [3,2,1]\nOutput: [3,1,2]\nExplanation: Swapping 2 and 1.\n\n\n
Example 2:
\n\n\nInput: arr = [1,1,5]\nOutput: [1,1,5]\nExplanation: This is already the smallest permutation.\n\n\n
Example 3:
\n\n\nInput: arr = [1,9,4,6,7]\nOutput: [1,7,4,6,9]\nExplanation: Swapping 9 and 7.\n\n\n
\n
Constraints:
\n\n1 <= arr.length <= 1041 <= arr[i] <= 104Compiled 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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