Given an array of intervals where intervals[i] = [start_i, end_i], merge all overlapping intervals and return an array of the non-overlapping intervals that cover all the intervals in the input.
1) What is the Java Collection Framework? Why it is introduced? 2) What is the root level interface of the Java collection framework? 3) What are the four main core interfaces of the Java collection ...
* Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level).
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