Lua显式栈：深层嵌套的循环化改造

local function sumBox(box)
    local s = box.coins or 0
    for _, c in ipairs(box.children or {}) do
        s = s + sumBox(c)           -- 层数失控即栈溢出
    end
    return s
end

local function sumBox(root)
    local stack, total = {root}, 0
    while #stack > 0 do
        local box = table.remove(stack)
        total = total + (box.coins or 0)
        for _, c in ipairs(box.children or {}) do
            stack[#stack + 1] = c   -- 子盒压栈待处理
        end
    end
    return total
end
sendmsg(actor, 1, "仓库格子金币总计 " ..
    sumBox({coins = 5, children = {{coins = 10}, {coins = 20}}}))