Stress Tester for Competitive Programming.
This is very useful when you have a code that gives wrong answer and you don't know why.
Write a brute force solution and compare it against your code, it will show you the testcases where you failed.

• Place the correct (but slow) brute force solution in the file brute_sol.cpp.
• Place the optimal (but wrong) solution in the file optimal_sol.cpp.
• Go to testcase_generator.py and modify the generate_and_print_testcase() function.
• In your terminal, run ./mapper.sh 20 for example to run 20 testcases.

Imagine the following simple and silly problem:
Given some n, print n if n <= 20 and otherwise print -1.
If for example our wrong code always outputs n no matter what, this is what will happen:



However if everything is working correctly, it will always look like this: