keeping track of solved code challenges

it's been one of my goals to get better at solving programming problems, so besides 'Advent of Code' every now and then, i'd like to keep solved solutions for any other websites that offer coding problems. As of now, that includes:

• Codeforces
• Leetcode

notes:

i'm using watchexec to compile and run the binary instantly.

watchexec -e cpp -r "g++ main.cpp && ./a.out < input.txt"