1. Step4.Carry on encodes, mutation , decodes operation with probability Pm to each individual in subgeneration population, and put all the parent and offspring into the subgeneration population;
   Step4.对子代群体中每个个体以概率Pm进行编码、变异、解码运算，将父代和子代都加入子代群体；
2. Choose two individuals in the population with probability Pc ,and carry on encodes , crossover, decodes operation, put all the parent and offspring into the subgeneration population;
   Step3.选择群体中两个个体以概率Pc进行编码、交叉、解码运算，将父代和子代都加入子代群体；

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