CP-Template

C++ Templates for Competitive Programming

Main file is main.cpp.

See also: zscoder's template

List of things (in order):

1. Segment/Fenwick tree

   • Segment tree (all ranges are closed i.e. l,r inclusive)
     • Point update
     • Range update (Lazy propagation)
     • Short iterative ver. [source]
     • 2D segment tree
     • Persistent segment tree
     • Segment tree beats (e.g. range min/max update) [source]
   • Fenwick tree: point and range update

2. String algorithms

   • Prefix function (KMP)
   • Z-algorithm
   • Trie
   • Aho-Corasick
   • Suffix Array

3. Graph theory

   • Algorithms/DS
     • DSU (Disjoint-set union)
     • Kruskal
     • Dijkstra
     • Floyd-Warshall
     • SPFA (Shortest path faster algorithm)/Bellman-Ford
     • Dinic Flow O(V^2E)
     • Edmonds-Karp: Min Cost Max Flow
     • Hopcroft-Karp matching (max-cardinality bipartite matching/MCBM)
     • Strongly connected component (SCC): Tarjan's algorithm
   • Common Techniques
     • Euler tour compression
     • Heavy-light decomposition (HLD)
     • Lowest Common Ancestor (LCA)
       • Euler tour method: O(log n) query
       • Depth method: O(log n) query
       • Sparse table: O(1) query but long
     • Virtual tree
     • Centroid decomposition: solving for all paths crossing current centroid

4. Data structures

   • Sparse table
   • Convex hull trick (CHT)
     • Dynamic version (LineContainer): O(log n) query
     • Offline version: O(1) query
   • Li Chao Tree [untested]

5. Maths

   • Combinatorics
     • Modular operations: Add, mult, inverse, binary exponentiation, binomial coefficients, factorials
     • getpf(): O(sqrt(n)) prime factorization
   • Matrix exponentiation
   • Number theory

6. Square root decomposition/Mo's algorithm

7. Convolutions

   • Fast Fourier Transform (FFT)
   • Number Theoretic Transform (NTT)
   • FFT Mod
   • Fast Walsh-Hadamard Transform (FWHT): AND, OR, XOR convolution

8. Geometry [untested]

9. Miscellaneous

   • Randomizer (Mersenne prime twister, mt19937)
   • unordered_map/hash map custom hash (http://xorshift.di.unimi.it/splitmix64.c)
   • Binary converter: print numbers in binary
   • Grid movement: 4/8 directions
   • Nearest pair of points