1570. Dot Product of Two Sparse Vectors

2021-05-17

Problem description:

Given two sparse vectors, compute their dot product.

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1249. Minimum Remove to Make Valid Parentheses

2021-05-16

Problem description:

Given a string s of '(' , ')' and lowercase English characters.

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1428. Leftmost Column with at Least a One

2021-05-13

Problem description:

(This problem is an interactive problem.)

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1396. Design Underground System

2021-05-11

Problem description:

An underground railway system is keeping track of customer travel times between different stations. They are using this data to calculate the average time it takes to travel from one station to another.

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953. Verifying an Alien Dictionary

2021-05-11

Problem description:

In an alien language, surprisingly they also use english lowercase letters, but possibly in a different order. The order of the alphabet is some permutation of lowercase letters.

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117. Populating Next Right Pointers in Each Node II

2021-05-11

Problem description:

Given a binary tree

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116. Populating Next Right Pointers in Each Node

2021-05-11

Problem description:

You are given a perfect binary tree where all leaves are on the same level, and every parent has two children. The binary tree has the following definition:

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122. Best Time to Buy and Sell Stock II

2021-05-06

Problem description:

You are given an array prices where prices[i] is the price of a given stock on the ith day.

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863. All Nodes Distance K in Binary Tree

2021-05-04

Problem description:

We are given a binary tree (with root node root), a target node, and an integer value K.

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1448. Count Good Nodes in Binary Tree

2021-05-03

Problem description:

Given a binary tree root, a node X in the tree is named good if in the path from root to X there are no nodes with a value greater than X.

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