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摘要： 1057. Campus Bikes Medium On a campus represented on the X-Y plane, there are n workers and m bikes, with n <= m. You are given an array workers of le 阅读全文

摘要： 881. Boats to Save People Medium You are given an array people where people[i] is the weight of the ith person, and an infinite number of boats where 阅读全文

摘要： 31. Next Permutation Medium A permutation of an array of integers is an arrangement of its members into a sequence or linear order. For example, for a 阅读全文

摘要： 1570. Dot Product of Two Sparse Vectors Medium 858114Add to ListShare Given two sparse vectors, compute their dot product. Implement class SparseVecto 阅读全文

摘要： 214. Shortest Palindrome Hard You are given a string s. You can convert s to a palindrome by adding characters in front of it. Return the shortest pal 阅读全文

摘要： 2116. Check if a Parentheses String Can Be Valid Medium A parentheses string is a non-empty string consisting only of '(' and ')'. It is valid if any  阅读全文

摘要： 318. Maximum Product of Word Lengths Given a string array words, return the maximum value of length(word[i]) * length(word[j]) where the two words do 阅读全文

摘要： 定义set emptySet = set() mySet = {'a','b','c'} tuple, 与list类似，但是是immutable的 如果你将一个list添加到set，就会报错；但是如果你将tuple添加到set是ok的，因为tuple 不可改变因此它的hash值是固定的 alist 阅读全文

摘要： Makefile 中 .PHONY的作用 https://www.cnblogs.com/idorax/p/9306528.html 阅读全文

摘要： 1861. Rotating the Box Medium You are given an m x n matrix of characters box representing a side-view of a box. Each cell of the box is one of the fo 阅读全文