399. Evaluate Division

2018-09-01

Problem description:

Equations are given in the format A / B = k, where A and B are variables represented as strings, and k is a real number (floating point number). Given some queries, return the answers. If the answer does not exist, return -1.0.

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Example:
Given a / b = 2.0, b / c = 3.0. 
queries are: a / c = ?, b / a = ?, a / e = ?, a / a = ?, x / x = ? . 
return [6.0, 0.5, -1.0, 1.0, -1.0 ].

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491. Increasing Subsequences

2018-08-31

Problem description:

Given an integer array, your task is to find all the different possible increasing subsequences of the given array, and the length of an increasing subsequence should be at least 2 .

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636. Exclusive Time of Functions

2018-08-31

Problem description:

Given the running logs of n functions that are executed in a nonpreemptive single threaded CPU, find the exclusive time of these functions.

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429. N-ary Tree Level Order Traversal

2018-08-31

Problem description:

Given an n-ary tree, return the level order traversal of its nodes’ values. (ie, from left to right, level by level).

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251. Flatten 2D Vector

2018-08-30

Problem description:

Implement an iterator to flatten a 2d vector.

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281. Zigzag Iterator

2018-08-30

Problem description:

Given two 1d vectors, implement an iterator to return their elements alternately.

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825. Friends Of Appropriate Ages

2018-08-29

Problem description:

Some people will make friend requests. The list of their ages is given and ages[i] is the age of the ith person.

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311. Sparse Matrix Multiplication

2018-08-29

Problem description:

Given two sparse matrices A and B, return the result of AB.

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819. Most Common Word

2018-08-29

Problem description:

Given a paragraph and a list of banned words, return the most frequent word that is not in the list of banned words. It is guaranteed there is at least one word that isn’t banned, and that the answer is unique.

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4. Median of Two Sorted Arrays

2018-08-28

Problem description:

There are two sorted arrays nums1 and nums2 of size m and n respectively.

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