feat(day_1): both exercises done

README.md

@@ -3,6 +3,6 @@
 Code Advent problems of 2025.
 
 | Day | Name            | Part 1 | Part 2 |
-| :-: | :--- | :----: | :----: |
-| 1 | | | |
+| :-: | :-------------- | :----: | :----: |
+|  1  | Secret Entrance |   ⭐   |   ⭐   |
 |  2  |                 |        |        |

src/exercises/day_1.ts

@@ -1,4 +1,108 @@
-export default function FirstDayExerciseName() {
-	console.log("test_module");
-	return 1;
+type Direction = "L" | "R";
+interface Intruction {
+  direction: Direction;
+  quantity: number;
+}
+
+const INITIAL_POSITION = 50;
+const MAX_POSITION = 99;
+
+export default async function FirstDayExerciseName() {
+  const instructions = await read_instruction_input();
+  const zero_count = find_zero_count(instructions);
+  const zero_count_any = find_zero_count_any(instructions);
+  console.log(">> zero_count", zero_count, zero_count_any);
+}
+
+function classic_module(left: number, right: number): number {
+  return ((left % right) + right) % right;
+}
+
+function find_zero_count_any(instructions: Intruction[]): number {
+  let zero_count = 0;
+  let current_position = INITIAL_POSITION;
+
+  instructions.forEach((instruction) => {
+    let count = 0;
+    // NOTE: Ugly solution, mathematics obvious does not work since are all positive numbers and HUGE rotations are allowed
+    switch (instruction.direction) {
+      case "L":
+        while (count < instruction.quantity) {
+          current_position -= 1;
+          if (current_position < 0) {
+            current_position = classic_module(
+              current_position,
+              MAX_POSITION + 1,
+            );
+          }
+          if (current_position === 0) {
+            zero_count += 1;
+          }
+          count++;
+        }
+        break;
+      case "R":
+        while (count < instruction.quantity) {
+          current_position += 1;
+          if (current_position > MAX_POSITION) {
+            current_position = classic_module(
+              current_position,
+              MAX_POSITION + 1,
+            );
+          }
+          if (current_position === 0) {
+            zero_count += 1;
+          }
+          count++;
+        }
+        break;
+    }
+  });
+
+  return zero_count;
+}
+
+function find_zero_count(instructions: Intruction[]): number {
+  let zero_count = 0;
+  let current_position = INITIAL_POSITION;
+
+  instructions.forEach((instruction) => {
+    switch (instruction.direction) {
+      case "L":
+        current_position = classic_module(
+          current_position - instruction.quantity,
+          MAX_POSITION + 1,
+        );
+        break;
+      case "R":
+        current_position = classic_module(
+          current_position + instruction.quantity,
+          MAX_POSITION + 1,
+        );
+    }
+    if (current_position === 0) {
+      zero_count += 1;
+    }
+  });
+
+  return zero_count;
+}
+
+async function read_instruction_input(): Promise<Intruction[]> {
+  const txt_input: string = await globalThis.Deno.readTextFile(
+    "src/exercises/assets/day_1_input.txt",
+  );
+  // NOTE: regex is useles here, since the split is done manually
+  const data_regex = new RegExp(/([RL][0-9]+)/g);
+  const data_match = txt_input.match(data_regex);
+  const instruction_list: Intruction[] = [];
+  data_match?.forEach((instruction) => {
+    const direction = instruction.slice(0, 1);
+    const quantity = instruction.slice(1);
+    instruction_list.push({
+      direction: direction as Direction,
+      quantity: parseInt(quantity),
+    });
+  });
+  return instruction_list;
 }

src/main.ts

@@ -1,17 +1,17 @@
+// Learn more at https://docs.deno.com/runtime/manual/examples/module_metadata#concepts
+if (import.meta.main) {
+  await main();
+}
+
 async function main(): Promise<number> {
-	const args = Deno.args;
+  const args = globalThis.Deno.args;
   if (!args || args.length !== 1) {
     return Promise.resolve(-1);
   }
   const day = parseInt(args[0]);
 
   const module = await import(`./exercises/day_${day}.ts`);
-	module.default();
+  await module.default();
 
   return Promise.resolve(0);
 }
-
-// Learn more at https://docs.deno.com/runtime/manual/examples/module_metadata#concepts
-if (import.meta.main) {
-	await main();
-}