Lua选择排序：每轮选最小的原地交换

local function sort(t)
    for i = 1, #t do
        for j = i + 1, #t do
            if t[j] < t[i] then
                t[i], t[j] = t[j], t[i]   -- 每次更小都交换，反复倒腾
            end
        end
    end
end

local function sort(t)
    for i = 1, #t - 1 do
        local mi = i
        for j = i + 1, #t do
            if t[j] < t[mi] then mi = j end   -- 只记下标不交换
        end
        if mi ~= i then
            t[i], t[mi] = t[mi], t[i]   -- 每轮仅一次交换
        end
    end
    return t
end
sendmsg(actor, 1, "排序首位矿石 " .. sort({30, 10, 50, 20})[1])