Double Hashing+KMP:

Resource:

1. https://www.youtube.com/watch?v=zbV0IRWBNvU&t=833s

2. http://www.shafaetsplanet.com/?p=3209

Practice :

1. https://vjudge.net/problem/LightOJ-1255

2. https://vjudge.net/problem/SPOJ-NHAY

3. https://vjudge.net/problem/CodeForces-4C

4. https://vjudge.net/problem/HDU-1686

5. https://codeforces.com/problemset/problem/1326/D2

6. https://toph.co/p/watercolor

Unordered Hashing/Hashing Rooted Tree:

Resource:

1. https://mathislife.github.io/assets/pdfs/Hashing.pdf

Practice:

1. https://codeforces.com/contest/901/problem/A

Trie/Prefix Tree:

Resource:

1. https://www.youtube.com/watch?v=zbV0IRWBNvU&t=4442s

Practice:

1. https://vjudge.net/contest/292749#overview

2. https://codeforces.com/problemset/problem/282/E