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usual me has asked 60 questions and find answers to 6 problems.

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usual me questions

Reference-type return functions and postfix increment
User-defined constructors and implicit default constructors
Why doesn't 1 + 1 use BINARY_ADD?
C++: initialization of int variables by an implicit constructor
What are these Python notations: `[ [] ] * n` and `(i,)`
Protected non-virtual destructor in the base class
Matching at least one lower case letter AND at least one upper case letter
Pandas - Choose the starting day when resampling every 2 weeks
Display non ascii (Japanese) characters in pandas plot legend
Why is one memoization strategy slower than the other?

usual me answers

Pandas - Choose the starting day when resampling every 2 weeks
Measuring increase in heap size after loading large object
Pandas: How could I iterate two dataframes which have exactly same format?
numpy: unique list of colors in the image
Count consecutive occurences of values varying in length in a numpy array