随笔分类 - LeetCode
摘要：In a special ranking system, each voter gives a rank from highest to lowest to all teams participating in the competition. The ordering of teams is de
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摘要：Given an array of digits digits, return the largest multiple of three that can be formed by concatenating some of the given digits in any order. If th
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摘要：Given an integer num, find the closest two integers in absolute difference whose product equals num + 1 or num + 2. Return the two integers in any ord
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摘要：You have n binary tree nodes numbered from 0 to n - 1 where node i has two children leftChild[i] and rightChild[i], return true if and only if all the
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摘要：Write a program to count the number of days between two dates. The two dates are given as strings, their format is YYYY-MM-DD as shown in the examples
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摘要：Given n orders, each order consists of a pickup and a delivery service. Count all valid pickup/delivery possible sequences such that delivery(i) is al
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摘要：Given a string s consisting only of characters a, b and c. Return the number of substrings containing at least one occurrence of all these characters
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摘要：There is a supermarket that is frequented by many customers. The products sold at the supermarket are represented as two parallel integer arrays produ
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摘要：You are given an integer array arr. Sort the integers in the array in ascending order by the number of 1's in their binary representation and in case
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摘要：You are given an array target of n integers. From a starting array arr consisting of n 1's, you may perform the following procedure : let x be the sum
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摘要：You are given an array of events where events[i] = [startDayi, endDayi]. Every event i starts at startDayi and ends at endDayi. You can attend an even
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摘要：Design an algorithm that accepts a stream of integers and retrieves the product of the last k integers of the stream. Implement the ProductOfNumbers c
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摘要：Given a `m x n` matrix `grid` which is sorted in non-increasing order both row-wise and column-wise, return *the number of **negative** numbers in* `g
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摘要：Given a `m * n` matrix `seats` that represent seats distributions in a classroom. If a seat is broken, it is denoted by `'#'` character otherwise it i
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摘要：A social media company is trying to monitor activity on their site by analyzing the number of tweets that occur in select periods of time. These perio
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摘要：You are given two strings of the same length `s` and `t`. In one step you can choose **any character** of `t` and replace it with **another character*
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摘要：Given an array `arr` of integers, check if there exist two indices `i` and `j` such that : - `i != j` - `0 这道题给了一个整型数组，让检测是否有一个数字和其倍数同时存在的情况。一看到这道题博主就
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摘要：Given an array of integers `arr`, you are initially positioned at the first index of the array. In one step you can jump from index `i` to index: - `i
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摘要：Given two numbers, `hour` and `minutes`, return *the smaller angle (in degrees) formed between the *`hour`* and the *`minute`* hand*. Answers within `
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摘要：Given an array of integers arr and two integers k and threshold, return *the number of sub-arrays of size k and average greater than or equal to *thre
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