Age | Commit message (Collapse) | Author |
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Revised problem "Buy five"
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Added Buy five problem.
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Simplify the testing function and add correct test cases for Prolog
problems mother/2 and brother/2.
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Added new exercises Pythagorean theorem.
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Some Prolog problems may be solved using previous solutions. This allows
us to test such programs, and still analyze the submission separately.
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In hint and test functions, we don't need any session data except the
Python runner.
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Also move the language-specific hint method for Prolog to prolog.common.
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