David Wang fcefa40b6c Add all different constraint.
This is a very simple all different constraint, e.g.

- It does not know that if there are more variables than candidates,
  it has reached a contradiction.

- It does not know that, if there are as many variables as candidates,
  if only one variable can take on a candidate value, then all other
  candidates for that variable can be eliminated.
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Description
Puzzle solving library, written in Rust.
155 KiB
Languages
Rust 100%