第二个方法，是Code Granker上面的，利用了高中学排列组合时候的概念。 有个‘abc’，那么总共可以看成'a_b_c' 5个字符位置 ...
This repository contains my daily problem-solving practice as part of my Java Full Stack Training. Problems are organized day-wise to track consistency, progress, and improvement over time.
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