QoS multicast routing problem is a nonlinear combination optimization problem, which has been proved to be a NP complete problem.

组播路由问题是一个非线性的组合优化问题，已证明了该问题是NP完全问题。

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Propose four delay-constrained multicast source routing algorithms to solve delay-constrained least-cost multicast routing problem.

针对时延约束的最小代价组播路由问题，提出四种时延约束组播源路由算法。

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Delay-constrained least-cost multicast routing problem is studied, and a multicast routing algorithm based on link optimizing is proposed to solve the problem.

研究具有时延约束的最小代价组播路由问题，提出一种基于链路优化的组播路由算法求解该问题。

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Delay-constrained least-cost multicast routing problem is studied, and a multicast routing algorithm based on link optimizing is proposed to solve the problem.

研究具有时延约束的最小代价组播路由问题，提出一种基于链路优化的组播路由算法求解该问题。

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