1 files changed, 31 insertions, 0 deletions
diff --git a/14-Longest-Collatz-Sequence/collatz.c b/14-Longest-Collatz-Sequence/collatz.c
new file mode 100644
index 0000000..ec77af6
--- /dev/null
+++ b/14-Longest-Collatz-Sequence/collatz.c
@@ -0,0 +1,31 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+// In C, it's immediately obvious my python solution is inefficient
+
+// For keeping track of the length of sequences
+// c is a temporary counter, s changes when c reaches a new maximum
+long int c = 0;
+long int s = 0;
+long int collatz(long int seed){
+    c++;
+    if(seed == 1)
+        return 0;
+    if(seed % 2 == 0)
+        seed = seed / 2;
+    else
+        seed = 3 * seed + 1;
+    collatz(seed);
+}
+
+int main(){
+    for(long int i = 1; i < pow(10, 6); i++){
+        c = 0;
+        collatz(i);
+        if(c > s){
+            s = c;
+        }
+    }
+    printf("The longest sequence has %d numbers \n", s);
+    return 0;
+}