组合数学中静电的nim算法，很有用处对于组合数学初学者-Combination of mathematical algorithms in static nim, very useful for beginners combinatorics

合肥工业大学组合数学（殷建宏）教学课件，共四章-Hefei University of combinatorics (Yan Jianhong) courseware, a total of four chapters

组合数学，现代计算机数学，计算机软件设计人员必学的课程。英文原版，难得。-Introductory Combinatorics

Dinic method of maximum flow construction, for O(n^3), using pseudo-maximal flow construction by Malhotra - Kumar - Maheshvari. By Vitold Lipsky ( Combinatorics for programmers , 1988). Written by: Amir Tulegenov, 2009