1 files changed, 64 insertions, 0 deletions
diff --git a/032.c b/032.c
new file mode 100644
index 0000000..13c40b5
--- /dev/null
+++ b/032.c
@@ -0,0 +1,64 @@
+
+#include <stdio.h>
+
+/*
+ * much faster than python version, though less optimized...
+ *
+ * to filter out duplicates and add numbers:
+ * $ ./032 | sort -u | tr "\n" "+" | sed 's/+$/\n/' | bc
+ *
+ */
+
+int is_pandigital(long int a, long int b, long int c)
+{
+	char digits[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+	char digit;
+	int i;
+
+	while(a > 0)
+	{
+		digit = a % 10;
+		if(digit == 0 || digits[digit]++)
+			return 0;
+		a /= 10;
+	}
+	while(b > 0)
+	{
+		digit = b % 10;
+		if(digit == 0 || digits[digit]++)
+			return 0;
+		b /= 10;
+	}
+	while(c > 0)
+	{
+		digit = c % 10;
+		if(digit == 0 || digits[digit]++)
+			return 0;
+		c /= 10;
+	}
+
+	for(i=1; i<10; i++)
+		if(digits[i] != 1)
+			return 0;
+	return 1;
+}
+
+int main(void)
+{
+	long int limit = 10000;
+	long int a, b, c;
+	for(a=2; a<limit; a++)
+	{
+		for(b=2; b<limit; b++)
+		{
+			c = a * b;
+			if(c > limit)
+				break;
+			if(is_pandigital(a, b, c))
+				printf("%ld\n", c);
+		}
+	}
+
+	return 0;
+}
+