update

2025-12-25 14:05:36 +01:00
commit a67e150d0f
12 changed files with 4913 additions and 0 deletions
--- a/day1.c
+++ b/day1.c
@@ -0,0 +1,60 @@
+#define DJSTD_BASIC_ENTRY
+#include "./djstdlib/core.c"
+
+int djstd_entry(Arena *arena, StringList args) {
+    string input = os_readEntireFile(arena, s("./day1-input"));
+
+    int64 dial = 50;
+    int64 lineNo = 0;
+    StringList split = strSplit(arena, s("\n"), input);
+
+    int32 password = 0;
+
+    for (EachEl(split, string, line)) {
+        if (!strEql(*line, s(""))) {
+            bool lineValid = false;
+            if (line->length > 1) {
+                char dir = line->str[0];
+                Int32Result numStrParsed = parsePositiveInt32(strChopStart(*line, 1));
+                if (numStrParsed.valid) {
+                    lineValid = true;
+
+                    int32 dialPrev = dial;
+                    int32 pwPrev = password;
+
+                    int32 turns = (+numStrParsed.result)/100;
+                    password += turns;
+
+                    int32 remainder = numStrParsed.result - (numStrParsed.result/100)*100;
+
+                    if (dir == 'L') {
+                        dial -= remainder;
+                    } else if (dir == 'R') {
+                        dial += remainder;
+                    }
+
+                    if (dialPrev != 0 && (dial >= 100 || dial <= 0)) {
+                        password += 1;
+                    }
+
+                    println("turn: %S, %d => %d, %d", *line, dialPrev, dial, password - pwPrev);
+
+                    dial %= 100;
+                    if (dial < 0) {
+                        dial += 100;
+                    }
+                }
+            }
+            if (!lineValid) {
+                println("Input corrupted at line %d", lineNo);
+                return 1;
+            }
+        }
+        lineNo++;
+    }
+
+    println("%d", password);
+
+    return 0;
+}
+