install https://marketplace.visualstudio.com/items?itemName=glelesius.build-and-run
fast buffered io
segment trees
treaps
hackercup template
exporter to a single file for codeforces.
string algorithms
geometry
modular arithmetic
binary indexed tree
disjoint set union
graph algos
fft
run tests on github
binary&golden ratio search
try improving hash set&sort
...