【入门夯实】二维表的初始化与遍历：网格数据的正确开法

local grid = {}
local row = {}
for x = 1, 5 do
    row[x] = 0
end
for y = 1, 5 do
    grid[y] = row
end
grid[1][3] = 1

local function newGrid(w, h)
    local g = {}
    for y = 1, h do
        local row = {}
        for x = 1, w do
            row[x] = 0
        end
        g[y] = row
    end
    return g
end
local flags = newGrid(5, 5)

local function showFlags(g, actorName)
    local actor = getplayerbyname(actorName)
    for y = 1, #g do
        local line = {}
        for x = 1, #g[y] do
            line[#line + 1] = g[y][x] == 1 and "旗" or "空"
        end
        sendmsg(actor, 1, "第" .. y .. "行 " .. table.concat(line, " "))
    end
end

local function sparseSet(g, x, y, v)
    if g[y] == nil then
        g[y] = {}
    end
    g[y][x] = v
end