According to the orbit of adjoining matrix of directed graph the problem of Hamiltonian cycle is described.

通过有向图的邻接矩阵的轨道来刻划图的哈密顿圈问题。

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Company executives expressed hope that oil directed activity and the presence of large international players and credit availability will sustain the North American cycle over a long period of time.

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That has helped to break the cycle of political violence which dogged the region, produced a healthy alternation of power, and directed attention to deep-rooted social problems.

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