update

app.cpp

@@ -229,8 +229,9 @@ int day3_main() {
 }
 
 int day4_main() {
-    Arena arena = createArena(Megabytes(16));
-    list<char> file = readEntireFile(&arena, strlit("./day-4-input"));
+    Arena mainArena = createArena(Megabytes(16));
+    Arena *arena = &mainArena;
+    list<char> file = readEntireFile(arena, strlit("./day-4-input"));
 
     int fileReadIndex = 0;
     int lines = 0;
@@ -251,23 +252,24 @@ int day4_main() {
         fileReadIndex += lineLength + 1;
     }
 
-    list<char> fileStripped = PushList(&arena, char, file.length - lines);
-    for (size_t i = 0; i < file.length; i++) {
-        if (file.data[i] != '\n') {
-            appendList(&fileStripped, (char)file.data[i]);
-        }
-    }
-
     string xmas = strlit("XMAS");
-    int c = 0;
     int count = 0;
-    for (int c = 0; c < fileStripped.length; c++) {
-        string segment = strSlice(fileStripped.data, c, c+xmas.len);
-        const char *print = cstring(&arena, segment);
-        printf("%s\n", print);
-        if (strEql(segment, xmas)) {
-            c += xmas.len;
-            count++;
+    for (int c = 0; c < file.length; c++) {
+        string strings[] = {
+            //forwards 
+            strSlice(file.data, c, c+xmas.len),
+            //down 
+            strSlice(file.data, c, c+xmas.len),
+            //forwardsReverse 
+            strReverse(arena, strSlice(file.data, c, c+xmas.len)),
+            //downReverse 
+            strReverse(arena, strSlice(file.data, c, c+xmas.len)),
+        };
+        for (size_t i = 0; i < ArrayCount(strings); i++) {
+            if (strEql(strings[i], xmas)) {
+                c += xmas.len;
+                count++;
+            }
         }
     }