good places to practice from :

https://www.a2oj.com/Categories.html

https://www.codechef.com/certification/data-structures-and-algorithms/prepare#foundation

https://codeforces.com/blog/entry/55274

https://onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=604

https://cp-algorithms.com/

https://codeforces.com/blog/entry/57282

https://www.leetfree.com/

DP resources : https://codeforces.com/blog/entry/73446

Segment Tree Problems : https://codeforces.com/blog/entry/22616

Some good CP tutorials: https://codeforces.com/blog/entry/57282

Segment tree beats: https://codeforces.com/blog/entry/57319

Square root decomposition problems : https://codeforces.com/blog/entry/23005

Amazon interview questions playlist: https://www.youtube.com/playlist?list=PLLucmoeZjtMR990BPePcn5WgoCM_OX0YB