摘要：
题目描述We know thatif a phone number A is another phone number B’s prefix, B is not able to becalled. For an example, A is 123 while B is 12345, after pressing 123, we callA, and not able to call B.Given N phone numbers, your task is to find whether there exits two numbers Aand B that A is B’sprefix.输入 阅读全文