






from __future__ import annotations

import random

# Adjacency list representation of this graph:
# https://en.wikipedia.org/wiki/File:Single_run_of_Karger%E2%80%99s_Mincut_algorithm.svg
UpperCamelCase											=      {
    '''1''': ['''2''', '''3''', '''4''', '''5'''],
    '''2''': ['''1''', '''3''', '''4''', '''5'''],
    '''3''': ['''1''', '''2''', '''4''', '''5''', '''10'''],
    '''4''': ['''1''', '''2''', '''3''', '''5''', '''6'''],
    '''5''': ['''1''', '''2''', '''3''', '''4''', '''7'''],
    '''6''': ['''7''', '''8''', '''9''', '''10''', '''4'''],
    '''7''': ['''6''', '''8''', '''9''', '''10''', '''5'''],
    '''8''': ['''6''', '''7''', '''9''', '''10'''],
    '''9''': ['''6''', '''7''', '''8''', '''10'''],
    '''10''': ['''6''', '''7''', '''8''', '''9''', '''3'''],
}




def       _a   (							lowerCamelCase__				)  ->      set[tuple[str, str]]:
 lowerCamelCase_							:    Union[str, Any]							=     {node: {node} for node in graph}

 lowerCamelCase_							:    Tuple							=     {node: graph[node][:] for node in graph}

 while len(lowerCamelCase__				) > 2:
  # Choose a random edge.
  lowerCamelCase_							:    Union[str, Any]							=     random.choice(list(graph_copy.keys()				)				)
  lowerCamelCase_							:    List[str]							=     random.choice(graph_copy[u]				)

  # Contract edge (u, v) to new node uv
  lowerCamelCase_							:    int							=     u + v
  lowerCamelCase_							:    Tuple							=     list(set(graph_copy[u] + graph_copy[v]				)				)
  uv_neighbors.remove(lowerCamelCase__				)
  uv_neighbors.remove(lowerCamelCase__				)
  lowerCamelCase_							:    Tuple							=     uv_neighbors
  for neighbor in uv_neighbors:
   graph_copy[neighbor].append(lowerCamelCase__				)

  lowerCamelCase_							:    Dict							=     set(contracted_nodes[u].union(contracted_nodes[v]				)				)

  # Remove nodes u and v.
  del graph_copy[u]
  del graph_copy[v]
  for neighbor in uv_neighbors:
   if u in graph_copy[neighbor]:
    graph_copy[neighbor].remove(lowerCamelCase__				)
   if v in graph_copy[neighbor]:
    graph_copy[neighbor].remove(lowerCamelCase__				)

    # Find cutset.
 lowerCamelCase_							:    str							=     [contracted_nodes[node] for node in graph_copy]
 return {
     (node, neighbor)
     for node in groups[0]
     for neighbor in graph[node]
     if neighbor in groups[1]
 }


if __name__ == "__main__":
       print(partition_graph(TEST_GRAPH))








def       _a   (							lowerCamelCase__				)  ->      list[int]:
 if len(lowerCamelCase__				) > 1:
  lowerCamelCase_							:    Optional[Any]							=     len(lowerCamelCase__				) // 2  # Finds the middle of the array
  lowerCamelCase_							:    int							=     arr[
      :middle_length
  ]  # Creates an array of the elements in the first half.
  lowerCamelCase_							:    List[Any]							=     arr[
      middle_length:
  ]  # Creates an array of the elements in the second half.
  lowerCamelCase_							:    Optional[Any]							=     len(lowerCamelCase__				)
  lowerCamelCase_							:    Optional[Any]							=     len(lowerCamelCase__				)
  merge(lowerCamelCase__				)  # Starts sorting the left.
  merge(lowerCamelCase__				)  # Starts sorting the right
  lowerCamelCase_							:    Dict							=     0  # Left Counter
  lowerCamelCase_							:    str							=     0  # Right Counter
  lowerCamelCase_							:    Tuple							=     0  # Position Counter
  while (
      left_index < left_size and right_index < right_size
  ):  # Runs until the lowers size of the left and right are sorted.
   if left_array[left_index] < right_array[right_index]:
    lowerCamelCase_							:    Optional[int]							=     left_array[left_index]
    left_index += 1
   else:
    lowerCamelCase_							:    Union[str, Any]							=     right_array[right_index]
    right_index += 1
   index += 1
  while (
      left_index < left_size
  ):  # Adds the left over elements in the left half of the array
   lowerCamelCase_							:    Tuple							=     left_array[left_index]
   left_index += 1
   index += 1
  while (
      right_index < right_size
  ):  # Adds the left over elements in the right half of the array
   lowerCamelCase_							:    Optional[int]							=     right_array[right_index]
   right_index += 1
   index += 1
 return arr


if __name__ == "__main__":
       import doctest

       doctest.testmod()
