tasks a-s

Task/Power-set/E/power-set.e

@@ -0,0 +1,9 @@
+pragma.enable("accumulator")
+
+def powerset(s) {
+  return accum [].asSet() for k in 0..!2**s.size() {
+    _.with(accum [].asSet() for i ? ((2**i & k) > 0) => elem in s {
+      _.with(elem)
+    })
+  }
+}