811. Subdomain Visit Count
Straight forward. Use String.split() and collections.Counter()to prettify code.
[LeetCode] Challenge log 728
728. Self Dividing Numbers
https://leetcode.com/problems/self-dividing-numbers/description/
Nothing worth mentioned.
[LeetCode] Challenge log 814
814. Binary Tree Pruning
https://leetcode.com/problems/binary-tree-pruning/description/
Another DFS problem.
[LeetCode] Challenge log 617
617. Merge Two BInary Trees
https://leetcode.com/problems/merge-two-binary-trees/description/
DFS Problem. Recursive Solution.