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Add doctests to graphs_floyd_warshall.py #11820

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Add doctests to graphs_floyd_warshall.py #11820

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18 changes: 18 additions & 0 deletions graphs/graphs_floyd_warshall.py
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,24 @@ def floyd_warshall(graph, v):
4. The above is repeated for each vertex k in the graph.
5. Whenever distance[i][j] is given a new minimum value, next vertex[i][j] is
updated to the next vertex[i][k].

>>> v = 4
>>> graph = [[0.0, 2.0, float("inf"), float("inf")],\
[1.0, 0.0, 3.0, float("inf")],\
[float("inf"), float("inf"), 0.0, float("inf")],\
[3.0, 5.0, 4.0, 0.0]]
>>> floyd_warshall(graph, v) # doctest: +NORMALIZE_WHITESPACE
<BLANKLINE>
The shortest path matrix using Floyd Warshall algorithm
<BLANKLINE>
0 2 5 INF
1 0 3 INF
INF INF 0 INF
3 5 4 0
([[0.0, 2.0, 5.0, inf],\
[1.0, 0.0, 3.0, inf],\
[inf, inf, 0.0, inf],\
[3.0, 5.0, 4.0, 0.0]], 4)
"""

dist = [[float("inf") for _ in range(v)] for _ in range(v)]
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