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Algorithm

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[Leetcode]200. Number of Islands

Dec 4, 20231 min read9 views

#Graph · Key Idea Extract 'row' and 'col' from the entire grid. Traverse all nodes, perform DFS when the value is 1. Within DFS, check boundary and...

[Leetcode]17. Letter Combinations of a Phone Number

Dec 4, 20231 min read9 views

#Graph · Key Idea Iterative 3 for-loops are required for the iterative solution. It's not feasible to use a single for-loop for all lists. Accumulate...

[Leetcode]46. Permutations

Dec 5, 20231 min read12 views

#Graph #Tree · Key Idea Iterate through nums While traversing, store the element in the path. Then, initialize newNums with the remaining nums after...

[Leetcode]17. Letter Combinations of a Phone Number

Dec 5, 20231 min read11 views

#Graph · Key Idea Pass start and path to DFS(). start denotes the index to start exploring from, initialized to 1. It increments with each recursion to...

[Leetcode]39. Combination Sum

Dec 5, 20231 min read3 views

#Graph · Key Idea Similar to '[Leetcode]46. Permutations' but allows the same start. [Leetcode]46. Permutations: ...

[Leetcode]78. Subsets

Dec 6, 20231 min read6 views

#Graph · Key Idea Solution 1 Divide branches into those that include each element as a subset and those that do not. Solution 2 Utilize pass-by-value...