How to Find Common Characters in an array of Strings?
Given an array A of strings made only from lowercase letters, return a list of all characters that show up in all strings within the list (including duplicates). For …
Category: java
How to Fix “Unsafe cannot be resolved to a type” in Eclipse/Java?
If you have the following two errors building your Java projects using Eclipse, Unsafe cannot be resolved to a type The import sun.misc.Unsafe cannot be resolved Then, this turns …
How to Find Second Minimum Node In a Binary Tree (Java)?
Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly two or zero sub-node. If the node has …
Algorithms: How to Find N-Repeated Element in Size 2N Array?
January 19, 2019
algorithms, data structure, Java, java, List / Array, programming languages
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In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times. Return the element repeated N times. Example …
How to Mirror a Binary Tree?
Given a binary tree like this: 8 / \ 6 10 / \ / \ 5 7 9 11 Your task is to mirror it which becomes this: 8 …