Layout problem is an important offshoot of Operation Research; it belongs to complex combinatorial optimization problem.
布局问题是运筹学的一个重要分支，属于复杂的组合优化问题。
Layout optimization is an NP-hard problem. It also belongs to complex nonlinear constrained optimization problem.
布局优化是NP难问题，也是复杂的非线性约束优化问题。
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