用XNA开发的一款连连看游戏，有多重关卡，使用C#语言开发，涉及基本算法-With XNA development of a Snake game, with multiple levels, using the C# language development, involving basic arithmetic

R树的基本操作代码，运用C语言来实现，算法精简。-The basic operation of the R-tree code, using C language to implement the algorithm streamlined.