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  • Default User Avatar

    Sorry, it turns out, I was wrong.
    I found a mistake in my program.
    You are right. All puzzles have one possible solution.

  • Default User Avatar

    "All puzzles have one possible solution." - that not exactly right.
    "Test_1_hard" have 470 possible solutions.
    "Test_2_hard" have 42 possible solutions.
    "Test_4_very_hard" have 686 possible solutions.
    Does "int check()" take this into account?