Leslie

代码说明：

说明：  利用leslie人口模型来解决数学建模中的鱼群数量增减的问题： 具体问题在《数学建模与实验》（科学出版社）的153页第四题。(Leslie population model using mathematical modeling to solve the problem of increase or decrease in the number of fish: specific issues in the " Mathematical Modeling and Experiment" (Science Press) is the fourth 153 title.)