Editorial for TLE '16 Contest 7 P1 - Math Helper


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Author: ZQFMGB12

This problem requires string processing and the ability to implement conditions.

A simple way to process the string is to take only the expression with x without y = and to strip the string of surrounding whitespace (just to be safe - the test data shouldn't actually contain whitespace after the expressions). We can use built-in functions such as find(), substr(), and atoi() in C++ instead of using many loops to get the values of a and b easily.

Afterward, we simply have to implement the simplifying conditions given in the problem statement. It is recommended to test the conditions in order of decreasing priority. For example, first check if ab = 0, then if b-1 = 0, etc.

Time Complexity: \mathcal{O}(T)


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