算法题29 从一个取值范围为1~N的不重复数列中找出所有满足两数和为N+1的数对 - 在水一方 - 博客频道 - CSDN.NET



算法题29 从一个取值范围为1~N的不重复数列中找出所有满足两数和为N+1的数对 - 在水一方 - 博客频道 - CSDN.NET

题目:一个整数数列,元素取值可能是1~N(N是一个较大的正整数)中的任意一个数,相同数值不会重复出现。设计一个算法,找出数列中符合条件的数对的个数,满足数对中两数的和等于N+1。复杂度最好是O(n),如果是O(n2)则不得分。

 


算法:建立一个map<数列元素值, 对应索引>. 对每个元素i,如果N+1-i不在map中,插入i,否则输出(i, map[i]).复杂度O(n).


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