1 files changed, 52 insertions, 0 deletions
diff --git a/day5.c b/day5.c
new file mode 100644
index 0000000..3d737b2
--- /dev/null
+++ b/day5.c
@@ -0,0 +1,52 @@
+#include <stdio.h>
+
+int oldmodel(char* line) {
+  int i;
+  char flags = 4, vowels = 0;
+
+  for(i = 0; i < 16; i++) {
+    if( line[i] == 'a' ||
+        line[i] == 'e' ||
+        line[i] == 'i' ||
+        line[i] == 'o' ||
+        line[i] == 'u'  ) vowels++;
+    if(i < 15) {
+      if(line[i] == line[i+1])               flags |= 2;
+      if(line[i] == 'a' && line[i+1] == 'b') flags &= 3;
+      if(line[i] == 'c' && line[i+1] == 'd') flags &= 3;
+      if(line[i] == 'p' && line[i+1] == 'q') flags &= 3;
+      if(line[i] == 'x' && line[i+1] == 'y') flags &= 3;
+    }
+  }
+  if (vowels > 2) flags |= 1;
+
+  return (flags == 7);
+}
+
+int newmodel(char* line) {
+  int i, j;
+  char flags = 0, vowels = 0;
+
+  for(i = 0; i < 14; i++) {
+    for(j = i+2; j < 16; j++)
+      if(line[i] == line[j] && line[i+1] == line[j+1]) flags |= 1;
+    if(line[i] == line[i+2]) flags |= 2;
+  }
+
+  return (flags == 3);
+}
+
+int main() {
+  char line[20];
+  int oldnice = 0, newnice = 0;
+
+  while (scanf("%s", line) != EOF) {
+    if(oldmodel(line)) oldnice++;
+    if(newmodel(line)) newnice++;
+  }
+
+  printf("Old model: %d\n", oldnice);
+  printf("New model: %d\n", newnice);
+
+  return 0;
+}