fifi努刷题

摘要： https://leetcode.com/problems/the-maze-ii/?tab=Description Thought: - BFS: It's looking for shortest distance, the initial thought is that BFS could b 阅读全文

摘要： https://leetcode.com/problems/the-maze/?tab=Description Thought: It only asks to return a boolean value of whether the ball can roll to destination; O 阅读全文

摘要： Given a permutation which contains no repeated number, find its index in all the permutations of these numbers, which are ordered in lexicographical o... 阅读全文

摘要： Given an array of n integer, and a moving window(size k), move the window at each iteration from the start of the array, find the median of the elemen... 阅读全文

摘要： Given an array of integers and a numberk, find knon-overlappingsubarrays which have the largest sum.The number in each subarray should becontiguous.Re... 阅读全文

摘要： https://leetcode.com/problems/bulls-and-cows/Examples:Secret: 1807 Secret: 1123Guess: 7810 ====> "0A3B" Guess: 0111 ===... 阅读全文

摘要： https://www.hackerrank.com/challenges/taum-and-bdayProblem StatementTaum is planning to celebrate the birthday of his friend, Diksha. There are two ty... 阅读全文

摘要： 1. First level Cache--Session.Querying of same object multiple times within a same session will only call DB for once, the rest of times will use cach... 阅读全文

摘要： What's 1+N problem?When you are querying for one table, it auto calls sql command for each relational database if the fetch type is eager.In such case... 阅读全文

摘要： 1.Annotation@Entitypublic class Teacher { private String name; private int id; private Set students; @ManyToMany @JoinTable(name="t_s",... 阅读全文