Lua同构字符串：双映射的一致性校验

local function isIsoBad(s, t)
    local map = {}
    for i = 1, #s do
        local a, b = s:sub(i, i), t:sub(i, i)
        if map[a] and map[a] ~= b then return false end
        map[a] = b
    end
    return true
end

local function isIso(s, t)
    local st, ts = {}, {}
    for i = 1, #s do
        local a, b = s:sub(i, i), t:sub(i, i)
        if (st[a] and st[a] ~= b)
            or (ts[b] and ts[b] ~= a) then
            return false
        end
        st[a], ts[b] = b, a
    end
    return true
end
local p = getplayerbyname("iso01")
sendmsg(p, 1, tostring(isIso("egg", "add")))