v0.4
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* Problem #4 works.
* Problem #4 test case and real solution works, runs in under 60 seconds.
Forgot to add test cases to Makefile
v0.5
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* Problem #5 works.
* Problem #5 test case and real solution works, runs in under 60 seconds.
Fixed version number
Merge branch 'v0.4' into v0.5
Fixed version number