first commit

1 files changed, 19 insertions, 0 deletions

diff --git a/problem31.erl b/problem31.erl
new file mode 100755
index 0000000..56a06ac
--- /dev/null
+++ b/problem31.erl
@@ -0,0 +1,19 @@
+-module(problem31).
+-export([solve/0]).
+
+solve() ->
+	length(gen_list(200)) + 8.
+
+gen_list(M) ->
+	A = lists:seq(0,198),
+	B = lists:seq(0,99),
+	C = lists:seq(0,39),
+	D = lists:seq(0,19),
+	E = lists:seq(0,9),
+	F = lists:seq(0,3),
+	G = lists:seq(0,1),
+	[ {S,T,U,V,W,X,Y} ||
+		S <- A, T <- B, U <- C, V <- D,
+		W <- E, X <- F, Y <- G,
+		S + 2*T + 5*U + 10*V + 20*W +
+		50*X + 100*Y =:= M ].