全排列数组，计算所有排列的结果，从中选最优结果。
full permutation array, calculate optimal permutation's result.
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Licenses
| License | URL |
|---|---|
| Apache License, Version 2.0 | https://www.apache.org/licenses/LICENSE-2.0 |
Developers
| Name | Dev Id | Roles | Organization | |
|---|---|---|---|---|
| Huan Song | changebooks<at>qq.com | | changebooks technologies inc. |