i think its a breadth first search algorithm

简明清晰的写出每个实验题目的算法步骤，可以混合使用自然语言、流程图及伪代码的方式，不能直接复制源程序。每个实验题目需要附上程序正确运行结果的截图。-Write clear and concise algorithm steps for each experimental subject, can be mixed with natural languages, flowcharts and pseudo code the way, can not be directly copied sourc