Would like to add some cp sheets in ladder section of problem-set-competitive-programming.md file,

[MishtiGarg250]

Both of the sheets are pretty useful for those who want to get really good in competitive programming,
I would like to work upon this one and has raised the pr

[sairamsharan]

Hello! I would like to work on adding these resources for Hacktoberfest.

[MishtiGarg250]

Hello! I would like to work on adding these resources for Hacktoberfest.

I have already raised a pr for this