[year2025day01] Solution

src/main/java/com/example/adventofcode/year2025/day01/SecretEntrance.java

@@ -0,0 +1,123 @@
+package com.example.adventofcode.year2025.day01;
+
+import java.io.IOException;
+import java.util.List;
+
+import static com.example.adventofcode.utils.FileUtils.readLines;
+
+public class SecretEntrance {
+    private static final String FILENAME = "AdventOfCodeData/2025/day01/input";
+    private static final String EXAMPLE_FILENAME = "AdventOfCodeData/2025/day01/example_input";
+
+
+    /**
+     * 0x434C49434B hex to text is "click"
+     */
+    public static void main(String[] args) throws IOException {
+        System.out.println(restorePasswordSimulation(EXAMPLE_FILENAME));
+        System.out.println(restorePasswordSimulation(FILENAME));
+        System.out.println(restorePasswordImproved(EXAMPLE_FILENAME));
+        System.out.println(restorePasswordImproved(FILENAME));
+        System.out.println(restorePasswordClickMethod(EXAMPLE_FILENAME));
+        System.out.println(restorePasswordClickMethod(FILENAME));
+    }
+
+    public static long restorePasswordSimulation(final String filename) throws IOException {
+        List<String> lines = readLines(filename);
+
+        int position = 50;
+        int count = 0;
+        for (String line: lines) {
+            String side = line.substring(0, 1);
+            int number = Integer.parseInt(line.substring(1));
+
+            if (side.equals("L")) {
+                for (int i = 0; i < number; i++) {
+                    if (position > 0) {
+                        position--;
+                    } else {
+                        position = 99;
+                    }
+                }
+            } else {
+                for (int i = 0; i < number; i++) {
+                    if (position < 99) {
+                        position++;
+                    } else {
+                        position = 0;
+                    }
+                }
+            }
+            if (position == 0) {
+                count++;
+            }
+        }
+
+        return count;
+    }
+
+    public static long restorePasswordImproved(final String filename) throws IOException {
+        List<String> lines = readLines(filename);
+
+        int position = 50;
+        int count = 0;
+        for (String line: lines) {
+            String side = line.substring(0, 1);
+            int number = Integer.parseInt(line.substring(1));
+
+            if (side.equals("L")) {
+                position -= number;
+                while (position < 0) {
+                    position += 100;
+                }
+            } else {
+                position += number;
+                while (position > 99) {
+                    position -= 100;
+                }
+            }
+
+            if (position == 0) {
+                count++;
+            }
+        }
+
+        return count;
+    }
+
+    public static long restorePasswordClickMethod(final String filename) throws IOException {
+        List<String> lines = readLines(filename);
+
+        int position = 50;
+        int count = 0;
+        for (String line: lines) {
+            String side = line.substring(0, 1);
+            int number = Integer.parseInt(line.substring(1));
+
+            if (side.equals("L")) {
+
+                for (int i = 0; i < number; i++) {
+                    if (position > 0) {
+                        position--;
+                        if (position == 0) {
+                            count++;
+                        }
+                    } else {
+                        position = 99;
+                    }
+                }
+            } else {
+                for (int i = 0; i < number; i++) {
+                    if (position < 99) {
+                        position++;
+                    } else {
+                        position = 0;
+                        count++;
+                    }
+                }
+            }
+        }
+
+        return count;
+    }
+}

src/test/java/com/example/adventofcode/year2025/day01/SecretEntranceTest.java

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+package com.example.adventofcode.year2025.day01;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.io.IOException;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class SecretEntranceTest {
+
+    private static Stream<Arguments> filepathsAndExpectedPassword() {
+        return Stream.of(
+                Arguments.of("AdventOfCodeData/2025/day01/example_input", 3),
+                Arguments.of("AdventOfCodeData/2025/day01/input", 1086)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("filepathsAndExpectedPassword")
+    void restorePasswordSimulation(final String filename,
+                                   final int expectedPassword) throws IOException {
+        assertEquals(expectedPassword, SecretEntrance.restorePasswordSimulation(filename));
+    }
+
+    @ParameterizedTest
+    @MethodSource("filepathsAndExpectedPassword")
+    void restorePasswordImproved(final String filename,
+                                 final int expectedPassword) throws IOException {
+        assertEquals(expectedPassword, SecretEntrance.restorePasswordImproved(filename));
+    }
+
+    private static Stream<Arguments> filepathsAndExpectedPasswordByClickMethod() {
+        return Stream.of(
+                Arguments.of("AdventOfCodeData/2025/day01/example_input", 6),
+                Arguments.of("AdventOfCodeData/2025/day01/input", 6268)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("filepathsAndExpectedPasswordByClickMethod")
+    void restorePasswordClickMethod(final String filename,
+                                    final int expectedPassword) throws IOException {
+        assertEquals(expectedPassword, SecretEntrance.restorePasswordClickMethod(filename));
+    }
+}