234 ch-2.raku

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+#!/usr/bin/env raku
+# :vim ft=raku sw=4 expandtab  # 🦋 ∅∪∩∋∈∉ ≡ ≢ «␤ » ∴
+use v6.d;
+use lib $?FILE.IO.cleanup.parent(2).add("lib");
+use Test;
+
+=begin comment
+234-2: Unequal Triplets     Submitted by: Mohammad S Anwar
+You are given an array of positive integers.
+
+Write a script to find the number of triplets (i, j, k) that satisfies num[i] != num[j], num[j] != num[k] and num[k] != num[i].
+
+Example 1
+Input: @ints = (4, 4, 2, 4, 3)
+Ouput: 3
+
+(0, 2, 4) because 4 != 2 != 3
+(1, 2, 4) because 4 != 2 != 3
+(2, 3, 4) because 2 != 4 != 3
+Example 2
+Input: @ints = (1, 1, 1, 1, 1)
+Ouput: 0
+Example 3
+Input: @ints = (4, 7, 1, 10, 7, 4, 1, 1)
+Output: 28
+
+triplets of 1, 4, 7  = 3x2×2 = 12 combinations
+triplets of 1, 4, 10 = 3×2×1 = 6  combinations
+triplets of 4, 7, 10 = 2×2×1 = 4  combinations
+triplets of 1, 7, 10 = 3x2x1 = 6 combinations
+=end comment
+
+my @Test =
+    3,  (4, 4, 2, 4, 3),
+    0,  (1, 1, 1, 1, 1),
+    28, (4, 7, 1, 10, 7, 4, 1, 1),
+;
+
+plan @Test/2;
+
+sub func( @a = @Test[1]) {
+    my @c = @a.combinations(3).grep( {
+            $_[0] ≠  $_[1]
+        and $_[1] ≠  $_[2]
+        and $_[2] ≠  $_[0] }
+    ).elems;
+}
+
+for @Test -> $exp, @in {
+    is func(@in), $exp, "$exp <- @in.raku()";
+}
+done-testing;
+exit;
+