随笔分类 - LeetCode
摘要：You’re now a baseball game point recorder. Given a list of strings, each string can be one of the 4 following types: + Integer (one round’s score): Di
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摘要：Given an unsorted array of integers, find the length of longest continuous increasing subsequence (subarray). Example 1: Example 2: Note: Length of th
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摘要：Given an unsorted array of integers, find the number of longest increasing subsequence. Example 1: Example 2: Note: Length of the given array will be
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摘要：Given a non empty special binary tree consisting of nodes with the non negative value, where each node in this tree has exactly two or zero sub node.
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摘要：Given a binary search tree and the lowest and highest boundaries as L and R, trim the tree so that all its elements lies in [L, R] (R = L). You might
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摘要：Given a 2D integer matrix M representing the gray scale of an image, you need to design a smoother to make the gray scale of each cell becomes the ave
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摘要：Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the or
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摘要：Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. E
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摘要：Initially on a notepad only one character 'A' is present. You can perform two operations on this notepad for each step: Copy All : You can copy all th
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摘要：Given a string, your task is to count how many palindromic substrings in this string. The substrings with different start indexes or end indexes are c
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摘要：You are given n pairs of numbers. In every pair, the first number is always smaller than the second number. Now, we define a pair (c, d) can follow an
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摘要：In LeetCode Store, there are some kinds of items to sell. Each item has a price. However, there are some special offers, and a special offer consists
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摘要：Given a non empty binary tree, return the average value of the nodes on each level in the form of an array. Example 1: Note: The range of node’s value
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摘要：Given an integer array, find three numbers whose product is maximum and output the maximum product. Example 1: Example 2: Note: The length of the give
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摘要：Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are n
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摘要：You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be rep
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摘要：Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite restaurants represented by strings. You need to h
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摘要：Given an m n matrix M initialized with all 0‘s and several update operations. Operations are represented by a 2D array, and each operation is represen
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摘要：We define a harmonious array is an array where the difference between its maximum value and its minimum value is exactly 1. Now, given an integer arra
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摘要：There is an m by n grid with a ball. Given the start coordinate (i,j) of the ball, you can move the ball to adjacent cell or cross the grid boundary i
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