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graceful_labeling (352B)

      1 # Graceful labeling
      2 
      3 https://en.wikipedia.org/wiki/Graceful_labeling
      4 
      5 - Vertices are labeled with distinct values in {0, ..., m}
      6 - Thus, each edge has an absolute value difference of at least 1 and at most m
      7 - A "graceful labeling" is one where each possible difference is achieved exactly once
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      9 Special cases:
     10 
     11 - [graceful_tree]
     12 
     13 Up: [graph_labeling]