207. Course Schedule

2018-08-08

Problem description:

There are a total of n courses you have to take, labeled from 0 to n-1.

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402. Remove K Digits

2018-08-02

Problem description:

Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible.

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767. Reorganize String

2018-08-02

Problem description:

Given a string S, check if the letters can be rearranged so that two characters that are adjacent to each other are not the same.

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452. Minimum Number of Arrows to Burst Balloons

2018-08-02

Problem description:

There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is the start and end coordinates of the horizontal diameter. Since it’s horizontal, y-coordinates don’t matter and hence the x-coordinates of start and end of the diameter suffice. Start is always smaller than end. There will be at most 104 balloons.

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763. Partition Labels

2018-08-01

Problem description:

A string S of lowercase letters is given. We want to partition this string into as many parts as possible so that each letter appears in at most one part, and return a list of integers representing the size of these parts.

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232. Implement Queue using Stacks

2018-08-01

Problem description:

Implement the following operations of a queue using stacks.

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439. Ternary Expression Parser

2018-08-01

Problem description:

Given a string representing arbitrarily nested ternary expressions, calculate the result of the expression. You can always assume that the given expression is valid and only consists of digits 0-9, ?, :, T and F (T and F represent True and False respectively).

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255. Verify Preorder Sequence in Binary Search Tree

2018-08-01

Problem description:

Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary search tree.

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131. Palindrome Partitioning

2018-07-30

Problem description:

Given a string s, partition s such that every substring of the partition is a palindrome.

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77. Combinations

2018-07-30

Problem description:

Given two integers n and k, return all possible combinations of k numbers out of 1 … n.

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