哈夫曼编码思想，假设用于通讯的电文由字符集{a,b,c,d,e,f,g}中的字母构成。它们在电文中出现的频度分别为{0.31,0.16,0.10,0.08,0.11,,0.20,0.04},
假设用于通讯的电文由字符集{a,b,c,d,e,f,g}中的字母构成。它们在电文中出现的频度分别为{0.31,0.16,0.10,0.08,0.11,,0.20,0.04},
获取一个数组类型['a','b','c','d','e','f','g'],转化为[['a','b'],['c','d'],['e','f','g']]这种类型的
