Lua最小栈：同步辅助的常数取小

local stack = {}
local function push(v)
    stack[#stack + 1] = v
end
local function pop()
    local v = stack[#stack]
    stack[#stack] = nil
    return v
end

local mainS, minS = {}, {}
local function mpush(v)
    mainS[#mainS + 1] = v
    local cur = minS[#minS]
    minS[#minS + 1] = (cur and cur < v) and cur or v
end
local function mpop()
    minS[#minS] = nil
    local v = mainS[#mainS]
    mainS[#mainS] = nil
    return v
end
local function getMin()
    return minS[#minS]
end
mpush(5); mpush(3); mpush(8); mpop()
local p = getplayerbyname("stack01")
sendmsg(p, 1, "当前最小 " .. getMin())