update

day3.c

@@ -0,0 +1,38 @@
+#define DJSTD_BASIC_ENTRY
+#include "./djstdlib/core.c"
+
+int djstd_entry(Arena *arena, StringList args) {
+    string input = os_readEntireFile(arena, s("./day3-input"));
+
+    StringList split = strSplit(arena, s("\n"), input);
+
+    int32 maxJoltage = 0;
+
+    for (EachEl(split, string, line)) {
+        if (strEql(*line, s(""))) {
+            break;
+        }
+        int32 firstDigit = 0;
+        int32 secondDigit = 0;
+        int32 secondDigStart = 0;
+        for (int32 i = 0; i < line->length - 1; i++) {
+            int32 currDigit = line->str[i] - '0';
+            if (firstDigit < currDigit) {
+                firstDigit = currDigit;
+                secondDigStart = i + 1;
+            }
+        }
+        for (int i = secondDigStart; i < line->length; i++) {
+            int32 currDigit = line->str[i] - '0';
+            if (secondDigit < currDigit) {
+                secondDigit = currDigit;
+            }
+        }
+        maxJoltage += firstDigit * 10 + secondDigit;
+    }
+
+    println("%d", maxJoltage);
+
+    return 0;
+}
+