Add /r/dailyprogrammer Challenge #306 Easy

daily/306easy/README.md

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+# [[2017-03-13] Challenge #306 [Easy] Pandigital Roman Numbers](https://www.reddit.com/r/dailyprogrammer/comments/5z4f3z/20170313_challenge_306_easy_pandigital_roman/)
+
+## Description
+
+1474 is a pandigital in Roman numerals (MCDLXXIV). It uses each of the symbols
+I, V, X, L, C, and M at least once. Your challenge today is to find the small
+handful of pandigital Roman numbers up to 2000. 
+
+## Output Description
+
+A list of numbers. Example: 
+
+    1 (I), 2 (II), 3 (III), 8 (VIII) (Examples only, these are not pandigital Roman numbers)
+
+## Challenge Input
+
+Find all numbers that are pandigital in Roman numerals using each of the
+symbols I, V, X, L, C, D and M *exactly* once.
+
+## Challenge Input Solution
+
+1444, 1446, 1464, 1466, 1644, 1646, 1664, 1666 
+
+See [OEIS sequence A105416](http://oeis.org/A105416) for more information.

daily/306easy/panroman.pas

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+uses strutils;
+
+var
+  i: int16;
+
+function ivxlcdm(s: string): boolean;
+  var
+    a: array['C'..'X'] of int8;
+    c: char;
+
+  begin
+    for c in 'IVXLCDM' do
+      a[c] := 0;
+    for c in s do
+      inc(a[c]);
+    for c in 'IVXLCDM' do
+      if a[c] <> 1 then
+        exit(false);
+    ivxlcdm := true
+  end;
+
+begin
+  for i := 1000 to 2000 do
+    if ivxlcdm(inttoroman(i)) then
+      writeln(i)
+end.