Matrix #3: Linear Basis (XOR Basis) & Simplex Method
XOR linear basis: full template with kth, range basis, normalisation; Nowcoder median example; CF 1101G prefix-XOR rank; gym 104768 C XOR-divisibility; Simplex LP solver.
Xor
Index
All notes
Combinatorics #0: Common Formulae & Conclusions
A compact toolkit of geometric sums, floor-sum transformations, XOR facts, Fibonacci identities, and perfect-square patterns.
Combinatorics #0.1: 计数中常用的结论
常见计数结论、Lucas 定理、不定方程解计数、平面分拆、DAG 路径计数、多项式平移、XOR 均匀性与若干竞赛常用结论。