There should be an additional test case for the case where the given expression does not contain any runes. If the given expression is "1+1=2", which does not contain the symbol "?", then the appropriate response would be "-1". However there isn't a test case validating that scenario.
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This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
The description addresses this scenario:
There should be an additional test case for the case where the given expression does not contain any runes. If the given expression is "1+1=2", which does not contain the symbol "?", then the appropriate response would be "-1". However there isn't a test case validating that scenario.
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution