从哈希表的思路拓展,从头到尾重排数组:把扫描到下标为i的数字时,首先比较这个数字(用m表示)是不是等于i。
如果是,则接着扫描下一个数字;如果不是,则再拿它和第m个数字进行比较。如果它和第m个数字相等,就找到了一个重复的数字(该数字在下标为i和第m的位置都出现了);
如果它和第m个数字不相等,就把第i个数字和第m个数字交换,把m放到属于它的位置。
接下来再重复这个比较、交换的过程,知道我们发现一个重复的数字。
在动手写代码前应该先想好测试用例)
测试用例
1.数组中带一个或多个重复数字
2.数组中不包含重复的数字
3.无效输入测试用例(空数组,数组数字越界等)
demo's Introduction
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