Here is the list of some of the good tutorials written by codeforces users :-
- DP on Trees by darkshadows
- Algorithm Gym :: Data Structures by PrinceOfPersia
- Everything about Segment Trees by PrinceOfPersia
- Efficient and easy Segtree by Al.Cash
- SOS DP by usaxena95
- Invariants and monovariants by TooNewbie
- Recurrent Sequences — Application of combinatorics in DP by TooNewbie
- Z algorithm by paladin8
- Mobius Inversion by Nisiyama_Suzune
- Dirichlet convolution by Nisiyama_Suzune
- C++ Tricks by HosseinYousefi
- Suffix Automata by quasisphere
- Fast convolution for 64-bit integers by quasisphere
- Tutorial for FFT/NTT Part 1 by sidhant
- Tutorial for FFT/NTT Part 2 by sidhant
- Non-trivial DP tricks & Techniques by zscoder
- Parallel Binary Search by himanshujaju
- Slope Trick by zscoder
- 0-1 BFS by himanshujaju
- 2-SAT by HosseinYousefi
- SQRT Tree by gepardo
- Sack(DSU on trees) by Arpa
- Transition between Z- and prefix functions by adamant
- C++ STL: map and set by adamant
- Link-Cut tree by adamant
- Manacher's algorithm and code readability by adamant
- Quaternion algebra and geometry by adamant
- General ideas and tricks by adamant
- On Fast Fourier Transform by adamant
- Convex Hull trick and Li chao tree by adamant
- Nearest Neighbor Search by P_Nyagolov
- A simple introduction to "Segment tree beats" by jiry_2
If you know some good tutorial on codeforces which is not in this list and another list provided below please mention it in the comments I will add that in the list.
Another Similar List
Good Blog Post Resources about Algorithm and Data Structures