pythonic tricks
string formatting
enumerate
reversing a subarray
shifted zip
return a list with 0 or 1 items
slicing to prevent list index out of range
array min
max array
max array from right
matrix transpose
matrix clockwise rotation
matrix anticlockwise rotation
itertools.product
single bidirectional pass
string contains all chars unordered
string contains all chars ordered
using xor for signedness
find missing number in array
int to base
depth first search
bfs
dp array sum
enum
Huffman Encoding
Splitting a list into to distinct lists