The solutions to problems 1-6 are structured as the codingchallenge package. Each problem has its own module, named problemX, where X is the problem number. The method solve is available in each module and it returns the correct answer.

All problems can be tested at once with

python test.py

which prints not only the answers to each problem, but also the execution time in milliseconds (best of 5 runs).

This is the output of test.py on my system (Linux + AMD Ryzen 4000)

problem 1: solution 376,	time (best of 5) = 8.184685 ms
problem 2: solution 21124,	time (best of 5) = 1.556899 ms
problem 3: solution 1064,	time (best of 5) = 0.027657 ms
problem 4: solution 1533776805,	time (best of 5) = 11.024844 ms
problem 5: solution 31626,	time (best of 5) = 54.881875 ms
problem 6: solution 4613732,	time (best of 5) = 0.003842 ms
problem 7: solution 26033,	time (best of 5) = 10015.359399 ms

N.B. the solution to problem 3 differs from the result posted on the instructions (1064 vs 1074). I believe this is a typo of the problem description, as I checked the result by hand as well.