factorisation
fft/Karatsuba
Gauss-Jordan
PowerMod/Inversion
MatrixMultiplication
Sieves/Primes
Primality testing

GEOMETRY ... a lot of things

2-SAT
Articulation / Bridges
BellmaFord
Centroid Decompositions
Dijkstra
Flow (Dinic/Hopford/FF)
Floyd Warshall
Isomorphishm of Trees
Jarnik Prim / Kruskal
LCA
LCT? [but prolly too long]
Min Cost Max Flow
MO - on tree
Shortest Path Modifications
Center Finding Algo
SCC
SPFA
Stoer Wagner (but also prolly not necessary)
Some Tarjan
Topo-sort
TSP
Union Find

Pascal Triangle
Combination Numbers

Stops
Ternary Search

Aho Corasick
Binary Search
Index of lowest rotation
KMP
LCP
Manacher
Median
MO
LIS
Next Character Function
Palindromic Tree
Rolling Hash
Sorting
Suffix Array
Suffix Automaton
Z-Function

Fenwick (1D 2D 3D)
HLD
Matrix operations
Monotone queue
RMQ
Cartesian Tree
Segment Tree
Treap
Trie

Possibly more