随笔分类 - LeetCode
摘要：You are given a string text. You should split it to k substrings (subtext1, subtext2, ..., subtextk) such that: subtexti is a non-empty string. The co
阅读全文
摘要：Implement a SnapshotArray that supports the following interface: SnapshotArray(int length) initializes an array-like data structure with the given len
阅读全文
摘要：Two players play a turn based game on a binary tree. We are given the root of this binary tree, and the number of nodes n in the tree. n is odd, and e
阅读全文
摘要：Given an array nums of integers, a move consists of choosing any element and decreasing it by 1. An array A is a zigzag array if either: Every even-in
阅读全文
摘要：Alice and Bob continue their games with piles of stones. There are a number of piles arranged in a row, and each pile has a positive integer number of
阅读全文
摘要：Given a 2D grid of 0s and 1s, return the number of elements in the largest square subgrid that has all 1s on its border, or 0 if such a subgrid doesn'
阅读全文
摘要：On an alphabet board, we start at position (0, 0), corresponding to character board[0][0]. Here, board = ["abcde", "fghij", "klmno", "pqrst", "uvwxy",
阅读全文
摘要：The Tribonacci sequence Tn is defined as follows: T0 = 0, T1 = 1, T2 = 1, and Tn+3 = Tn + Tn+1 + Tn+2 for n >= 0. Given n, return the value of Tn. Exa
阅读全文
摘要：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 maximum is
阅读全文
摘要：Given an array arr of positive integers, consider all binary trees such that: Each node has either 0 or 2 children; The values of arr correspond to th
阅读全文
摘要：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 parall
阅读全文
摘要：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) - that
阅读全文
摘要：In a project, you have a list of required skills req_skills, and a list of people. The ith person people[i] contains a list of skills that the person
阅读全文
摘要：We are given hours, a list of the number of hours worked per day for a given employee. A day is considered to be a tiring day if and only if the numbe
阅读全文
摘要：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 that the
阅读全文
摘要：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 It can
阅读全文
摘要：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 with a fo
阅读全文
摘要：There are n flights that are labeled from 1 to n. You are given an array of flight bookings bookings, where bookings[i] = [firsti, lasti, seatsi] repr
阅读全文
摘要：Given a valid (IPv4) IP address, return a defanged version of that IP address. A defanged IP address replaces every period "." with "[.]". Example 1:
阅读全文
摘要：Return the result of evaluating a given boolean expression, represented as a string. An expression can either be: "t", evaluating to True; "f", evalua
阅读全文
