include list>usingnamespacestd;classvisitor;classelement{pubicc
"list"usingnamespacestd;classvisitor;classparkelement{public
turtle库绘图以及moduleturtlehasnofdmember
h"#include iostream>usingnamespacestd;template classt>classquene
下面是上述方法的实现:#include iostream>usingnamespacestd;/* c
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