C++-循环while-对于给定的任意正整数（个位可为0），将其各个位上的数字分离并倒序输出
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Background
Description
对于给定的任意正整数（个位可为0），将其各个位上的数字分离并倒序输出：
输入：123
输出：321
Format
Input
Output
Samples
123
321
12300
00321
Limitation
1s, 1024KiB for each test case.
