1 files changed, 37 insertions, 0 deletions
diff --git a/012.c b/012.c
new file mode 100644
index 0000000..c5cc49e
--- /dev/null
+++ b/012.c
@@ -0,0 +1,37 @@
+#include <math.h>
+
+int count_divisors(unsigned int triangle)
+{
+	unsigned int i;
+	int count = 2;
+	int limit = (int) ceil(sqrt(triangle));
+	for(i=2; i<limit; i++)
+	{
+		if(triangle % i == 0)
+		{
+			if(triangle / i == i)
+				count++;
+			else
+				count += 2;
+		}
+	}
+	return count;
+}
+
+int main()
+{
+	unsigned int triangle = 0;
+	int divisors = 0;
+	int count = 1;
+
+	do
+	{
+		triangle += count++;
+		divisors = count_divisors(triangle);
+	} while(divisors <= 500);
+
+	printf("%d\n", triangle);
+
+	return 0;
+}
+