Data commit

Task/Combinations/Lua/combinations.lua

@@ -0,0 +1,12 @@
+function map(f, a, ...) if a then return f(a), map(f, ...) end end
+function incr(k) return function(a) return k > a and a or a+1 end end
+function combs(m, n)
+  if m * n == 0 then return {{}} end
+  local ret, old = {}, combs(m-1, n-1)
+  for i = 1, n do
+    for k, v in ipairs(old) do ret[#ret+1] = {i, map(incr(i), unpack(v))} end
+  end
+  return ret
+end
+
+for k, v in ipairs(combs(3, 5)) do print(unpack(v)) end