四色图着色问题，离散数学的经典算法，用c实现，输入一个图，用小于4种颜色着色-four-color map coloring, Discrete Mathematics classical algorithm, using c realize that the importation of a map, with less than four colors Coloring

图论算法实现，含树，欧拉圈，霍夫曼编码，图的连通性，着色树，最短路径等，且采用加载皮肤界面，界面美观-Graph algorithms, including trees, Euler circles, Huffman coding, graph connectivity, coloring trees, shortest paths, and the interface with loads of skin, beautiful interface