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Answers for “视频中提到的构建近似算法的四种常见设计技术是什么?”

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The four techniques are greedy strategies, LP relaxation and rounding, the primal-dual schema, and local search.

Conditions: Applies to the design of approximation algorithms for NP-hard problems.

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FPTAS and PTAS allow arbitrarily close approximation. APX allows constant-factor approximation.

Conditions: Comparing standard approximation classes for optimization problems.