摘要： 题目如下： Consider a directed graph, with nodes labelled 0, 1, ..., n-1. In this graph, each edge is either red or blue, and there could be self-edges or 阅读全文

摘要： 题目如下： Given two arrays of integers with equal lengths, return the maximum value of: |arr1[i] - arr1[j]| + |arr2[i] - arr2[j]| + |i - j| where the maxi 阅读全文

摘要： 题目如下： Given two arrays arr1 and arr2, the elements of arr2 are distinct, and all elements in arr2 are also in arr1. Sort the elements of arr1 such tha 阅读全文

摘要： 题目如下： Given a rooted binary tree, return the lowest common ancestor of its deepest leaves. Recall that: The node of a binary tree is a leaf if and onl 阅读全文

摘要： 题目如下： Given a list of dominoes, dominoes[i] = [a, b] is equivalent to dominoes[j] = [c, d] if and only if either (a==c and b==d), or (a==d and b==c) - 阅读全文

摘要： 题目如下： There are n flights, and they are labeled from 1 to n. We have a list of flight bookings. The i-th booking bookings[i] = [i, j, k] means that we 阅读全文

摘要： 题目如下： A string is a valid parentheses string (denoted VPS) if and only if it consists of "(" and ")" characters only, and: It is the empty string, or 阅读全文

摘要： 题目如下： Given the root of a binary tree, each node in the tree has a distinct value. After deleting all nodes with a value in to_delete, we are left wit 阅读全文

摘要： 题目如下： Given a valid (IPv4) IP address, return a defanged version of that IP address. A defanged IP address replaces every period "."with "[.]". Exampl 阅读全文

摘要： 题目如下： Return the result of evaluating a given boolean expression, represented as a string. An expression can either be: "t", evaluating to True; "f", 阅读全文