October Long Challenge 2020 video solution

[Chef and Easy Queries]
problem link-(https://www.codechef.com/OCT20B/problems/CHEFEZQ)
solution link- https://youtu.be/DrxilCbLJp0

[Positive AND]
problem link-(https://www.codechef.com/OCT20B/problems/POSAND)
solution link- https://youtu.be/gwg2YgBBOng

[Replace for X]
problem link-(https://www.codechef.com/OCT20B/problems/REPLESX)
solution link-https://youtu.be/F3fFdyMim-A

suggestions are most welcome🙃…