随机填充25个数到9*9格子，并且保证每行不少于一个数

fit_number.lua

local function gen()
    local arr = {}
    for i = 1, 9 * 9 do
        arr[i] = i > 25 and 0 or i
    end
    return arr
end

local function pr(arr)
    local r = {}
    local ck = 0
    for k, v in ipairs(arr) do 
        table.insert(r, v)
        ck = ck + v
        if (k % 9 == 0) then
            print(table.concat(r, ','))
            assert(ck ~= 0)
            ck = 0
            r = {}
        end
    end
end

local function shuffle(arr)
    local idx = {}
    local line = {}
    for i = 1, 9 do
        line[i] = 0
    end

    math.randomseed(os.time())
    for _ = 1, #arr do
        local r1 = math.random(#arr)
        local r2 = math.random(#arr)
        arr[r1], arr[r2] = arr[r2], arr[r1]

        if arr[r1] > 0 then
            idx[arr[r1]] = r1
        end
        
        if arr[r2] > 0 then
            idx[arr[r2]] = r2
        end
    end

    for k, v in pairs(idx) do
        local n = math.ceil(v / 9)
        line[n] = line[n] + 1
    end

    local nv, nk = next(idx)
    for i, v in ipairs(line) do
        if v == 0 then
            while math.ceil(nk / 9) == i do
                nv, nk = next(idx, nv)
            end
            local n = (i - 1) * 9 + math.random(9) + 1
            arr[n] = nv
            arr[nk] = 0
        end
    end
end

local arr = gen()
shuffle(arr)
pr(arr)