Write a program to find the node at which the intersection of two singly linked lists begins.
解题：
1. 指针p指向A，指针q指向B 2. 指针p遍历A后遍历B，指针q遍历B后遍历A 3. pq必然会在交点处相遇
标签：shangdixinxi 上地信息
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