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针对卡哥写的C++递归回溯,卡哥写的回溯有点绕,前面又return true,后面最终为return false。卡哥这个地方也没讲清楚,一笔带过了,所以我结合之前的对称二叉树,直接return leftpath || rightpath;对左右子树取或操作,更好理解,我认为