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import std/[sequtils, setutils, sugar, unittest]
# run tests with following command:
# nim c -r ch_2.nim
proc consistent_strings(allowed: string, arr1: openArray[string]): int =
let
allowed_chars = toSet(allowed)
result = countIt(mapIt(arr1, toSet(it)), it <= allowed_chars)
suite "consistent strings":
test "\"ab\", [\"ad\", \"bd\", \"aaab\", \"baa\", \"badab\"]":
let
allowed = "ab"
arr1 = ["ad", "bd", "aaab", "baa", "badab"]
check(consistent_strings(allowed, arr1) == 2)
test "\"abc\", [\"a\", \"b\", \"c\", \"ab\", \"ac\", \"bc\", \"abc\"]":
let
allowed = "abc"
arr1 = ["a", "b", "c", "ab", "ac", "bc", "abc"]
check(consistent_strings(allowed, arr1) == 7)
test "\"cad\", [\"cc\", \"acd\", \"b\", \"ba\", \"bac\", \"bad\", \"ac\", \"d\"]":
let
allowed = "cad"
arr1 = ["cc", "acd", "b", "ba", "bac", "bad", "ac", "d"]
check(consistent_strings(allowed, arr1) == 4)
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