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In the last round Codeforces Round #838 (Div. 2) I managed to solve A, B, and C in about 45 minutes even faster than a friend of mine who is a master and faster than lots of experts. I was left with about 1:45:00 to solve D but in vain. This happens many times in recent rounds, solving the first 3 problems so quickly and D is the big obstacle that seems impossible to approach.
If anyone can give me some advice to attack D more efficiently I'll be thankful.
What can really cause such a runtime error with this version of the GNU C++ compiler? The only thing I thought about was a bug in this version, which was fixed later in GNU C++17.
This is my first time submitting an answer with python. I tried PyPy 3-64 but got runtime error, I thought it was my fault to submit with PyPy as the language which I don't know anything about it. Then I tried to submit again with Python 3 in no vain.
These are my submissions:
Can anyone help?!
