It contains solutions to some problem.
Resources:
https://drive.google.com/file/d/1J2x8pIYQ3MXANgvzOgBciWd3d79j_Exa/view
https://codeforces.com/blog/entry/53341
https://www.topcoder.com/community/competitive-programming/tutorials/
https://codeforces.com/blog/Geothermal
https://github.com/Errichto/youtube/wiki/How-to-practice%3F
https://github.com/bqi343/USACO