LeetCode 903: Valid Permutations for DI Sequence
A clear explanation of counting valid DI permutations using dynamic programming and prefix sums.
Tag
Permutation
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LeetCode 949: Largest Time for Given Digits
A clear explanation of solving Largest Time for Given Digits by checking all permutations of four digits.
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A clear explanation of Next Greater Element III using the next permutation algorithm on the digits of an integer.
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A clear explanation of the Palindrome Permutation II problem using character counts and backtracking over half of the palindrome.
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