简单算法
简单算法如下, 核心思路是值域有限，转化成反函数bool isUsedByA = {0};
bool isUsedByB = {0};
for each value in a[]
begin
isUsedByA = true;
end
for each char_elem in b[]
begin
isUsedByB = true;
end
define buffer c
step idx from 0 to 255
begin
if (isUsedByA && !isUsedByB)
{
c.push_back(idx);
}
end
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