local N = 4

-- 0 means no edge
local adjMatrix = {
	{ 0, 5, 3, 0 }, -- edges from vertex 0
	{ 0, 0, 0, 2 }, -- edges from vertex 1
	{ 0, 0, 0, 7 }, -- edges from vertex 2
	{ 0, 0, 0, 0 }, -- edges from vertex 3
}

for i = 1, N do
	for j = 1, N do
		io.write(adjMatrix[i][j], " ")
	end
	print()
end

local function foreach(list, fn)
	for _, v in ipairs(list) do
		fn(v)
	end
end

local numbers = { 10, 20, 30 }

foreach(numbers, print)

print("Hello")