题目描述：

LeetCode 438. Find All Anagrams in a String

Given a string s and a non-empty string p, find all the start indices of p's anagrams in s.

Strings consists of lowercase English letters only and the length of ...

题目描述：

LeetCode 437. Path Sum III

You are given a binary tree in which each node contains an integer value.

Find the number of paths that sum to a given value.

The path does not need to start or end ...

题目描述：

LeetCode 420. Strong Password Checker

A password is considered strong if below conditions are all met:

1. It has at least 6 characters and at most 20 characters.
2. It must contain at least one lowercase letter, at least one uppercase ...

题目描述：

LeetCode 433. Minimum Genetic Mutation

A gene string can be represented by an 8-character long string, with choices from "A","C","G","T". 

Suppose we need to investigate about a mutation (mutation from "start" to "end"), where ONE ...

下面的Java代码实现了正弦、余弦波形图的绘制，main方法位于DataWindow.java中。

DataPanel.java

import java.awt.Color;
import java.awt.Graphics;
import java.text.DateFormat;
import java.util.ArrayList;

import javax.swing.JPanel;

public class DataPanel extends JPanel {

    private static final long serialVersionUID = -9039511286331044798L;

    private int index ...