文件名称:74-1
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若干城市的信息存入一个带头结点的单链表，结点中的城市信息包括城市名、城市的位置坐标。要求：
给定一个城市名，返回其位置坐标。
给定一个位置坐标P和一个距离D，返回所有与P的距离小于等于D的城市。-1. The number of city information in a lead the singly linked list of nodes, node of city information including city name, the coordinates of the city.Requirements:
(1) given a city name, returns to its position coordinates.
(2) given a position coordinates of P and a distance D, return all cities and P distance less than or equal to D.
给定一个城市名，返回其位置坐标。
给定一个位置坐标P和一个距离D，返回所有与P的距离小于等于D的城市。-1. The number of city information in a lead the singly linked list of nodes, node of city information including city name, the coordinates of the city.Requirements:
(1) given a city name, returns to its position coordinates.
(2) given a position coordinates of P and a distance D, return all cities and P distance less than or equal to D.
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74-1.cpp