Java array permutation and combination problem summary
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Java
During the interview or written examination, I have encountered the following four hand tearing algorithms for arrangement and combination for many times. Here is a note for future reference:
1. Array without duplicate elements, complete arrangement; 2. Complete the array with repeated elements; 3. For arrays without duplicate elements, find the combination [subset]; 4. For arrays with duplicate elements, find the combination;
The above four types of questions can be realized with a unified template, as shown below:
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