1 files changed, 55 insertions, 0 deletions
diff --git a/day10/day10.c b/day10/day10.c
new file mode 100644
index 0000000..3286198
--- /dev/null
+++ b/day10/day10.c
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int encode(char* dest, char* src) {
+  int d = 0, s = 0, num;
+  char c;
+
+  while(src[s] != '\0') {
+    c = src[s];
+    num = 0;
+
+    while(src[s] == c) {
+      num++;
+      s++;
+    }
+
+    d += sprintf(dest + d, "%d", num);
+    dest[d++] = c;
+  }
+  dest[d] = '\0';
+
+  return d;
+}
+
+int main() {
+  char *this, *next;
+  int i, len;
+
+  this = (char*) malloc(11 * sizeof(char));
+  next = (char*) malloc(21 * sizeof(char));
+
+  scanf("%s", this);
+
+  for(i = 0; i < 20; i++) {
+    len = encode(next, this);
+    this = realloc(this, (2*len)+1);
+    len = encode(this, next);
+    next = realloc(next, (2*len)+1);
+  }
+
+  printf("First final length: %d\n", len);
+
+  for(i = 0; i < 5; i++) {
+    len = encode(next, this);
+    this = realloc(this, (2*len)+1);
+    len = encode(this, next);
+    next = realloc(next, (2*len)+1);
+  }
+
+  printf("Second final length: %d\n", len);
+
+  free(this);
+  free(next);
+  return 0;
+}