送交者: maths 于 2006-08-10, 13:48:39:

回答: 唉，黎老的3色填中国地图没错啊。 由 繁孔 于 2006-08-10, 11:34:06:

• Actually, I think Kempe chain is the most beautiful part in proving - mangolasi (133 bytes) 2006-08-10, 16:44:05 (97609)

加跟贴