Reverse just the vowel characters in the string
In this problem, we need to simulate the typing event with backspace.
In this problem, we need to utilize the DFS (Depth-First Search) approach to traverse the entire tree
Determine if a number is a power of three using a loop.
Determine if a number is a power of two using a loop. Be mindful of language differences in division behavior.
This problem can be seen as part of a series related to the "Contains Duplicate" problem, with a slight difference.
We can determine if one string is a subsequence of another string through a simple iteration.
'isomorphic' means each alphabet is map to another one. Discover how to solve this efficiently with iteration.
We can easily solve this problem through iteration, but are there any important considerations?
In this problem, we need to check if each character corresponds to a distinct word.