solved day 6 a

day6/day6a.c

@@ -0,0 +1,30 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <math.h>
+#include <ctype.h>
+
+#define RACES 4
+
+int main()
+{
+	// unsigned long int times[RACES] = {7, 15, 30};
+	// unsigned long int distances[RACES] = {9, 40, 200};
+	unsigned long int times[RACES] = {44, 80, 65, 72};
+	unsigned long int distances[RACES] = {208, 1581, 1050, 1102};
+	unsigned long int numWins[RACES] = {0};
+	unsigned long int range = 0;
+	unsigned long int sum = 1;
+
+	for (unsigned long int i = 0; i < RACES; i++) {
+		for (unsigned long int j = 0; j < times[i]; j++) {
+			range = j * (times[i] - j);
+			printf("%d = %d * (%d - %d)\n", range, j, times[i], j);
+			if (range > distances[i]) numWins[i]++;
+		}
+		if (numWins[i] > 0) sum *= numWins[i];
+	}
+
+	printf("sum: %d\n", sum);
+}

day6/input

@@ -0,0 +1,2 @@
+Time:      7  15   30
+Distance:  9  40  200