# Blogue Mathspp

### Um blogue dedicado à matemática e à programação.

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##### TIL #017 – symmetrical indexing with bitwise inversion

Today I learned about the symmetry in indexing from the beginning and end of a list with the bitwise invert operator.

##### Problem #050 – 8 queens

In how many ways can you place 8 queens on a chessboard?

##### TIL #016 – Quicksort in functional programming

Today I learned how to write the Quicksort algorithm in a weird functional style.

##### String formatting comparison | Pydon't 🐍

This article compares the three main string formatting methods in Python and suggests which methods to use in each situation.

##### TIL #015 – DARPA network challenge

Today I learned about the DARPA network challenge and the power of referral systems.

##### Counting mosaics with APL

This is a short article on how I quickly used APL to verify my combinatorics calculations.

##### Problem #049 – coin pyramid

Can you make the pyramid point the other way by moving only three coins?

##### TIL #014 – reading files with pathlib

Today I learned you can use pathlib to read the contents of a file.

##### Pass-by-value, reference, and assignment | Pydon't 🐍

When you call a function in Python and give it some arguments... Are they passed by value? No! By reference? No! They're passed by assignment.

##### TIL #013 – dunder method __eq__

Today I learned how the rich comparison protocol and, in particular, how eq works behind the scenes.