Question: An Euler tour of a directed graph G with n vertices and m edges is a cycle that traverses each edge of G exactly once

An Euler tour of a directed graph G with n vertices and m edges is a cycle that traverses each edge of G exactly once according to its direction. Such a tour always exists if G is connected and the in-degree equals the out-degree of each vertex in G. Describe an O(n+m)-time algorithm for finding an Euler tour of such a directed graph G.

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