Determines if it is safe to include vertex `v` in the Hamiltonian cycle path. # Arguments `v` - The index of the vertex being considered. `visited` - A reference to the vector representing the visited vertices. `path` - A reference to the current path being explored. `pos` - The position of the current vertex being considered. # Returns `true` if it is safe to include `v` in the path, `false`
(&self, v: usize, visited: &[bool], path: &[Option<usize>], pos: usize)
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