Lua第二大值：一次扫描的双冠军跟踪

local function secondBySort(t)
    local copy = {table.unpack(t)}
    table.sort(copy)
    return copy[#copy - 1]
end

local function secondBig(t)
    local first, second = -math.huge, -math.huge
    for _, v in ipairs(t) do
        if v > first then
            second = first
            first = v
        elseif v > second and v < first then
            second = v
        end
    end
    return second
end
local p = getplayerbyname("sec01")
sendmsg(p, 1, "第二大 " .. secondBig({70, 90, 90, 60}))