feat: kata/the-latest-clock (#681)

* docs: kata description * docs: sync progress * feat: kata/the-latest-clock --------- Co-authored-by: ParanoidUser <5120290+ParanoidUser@users.noreply.github.com>
ParanoidUser · Oct 13, 2024 · 3cbbb58 · 3cbbb58
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diff --git a/docs/README.md b/docs/README.md
@@ -1,7 +1,7 @@
 # Codewars Handbook ☕️🚀
 
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-[![Completed kata 👌](https://img.shields.io/badge/completed%20kata-69.0%25-red.svg)](https://www.codewars.com/kata/search/java?xids=completed)
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@@ -25,7 +25,7 @@ slug.
 
 | [1 kyu](/kata/1-kyu/index.md) | [2 kyu](/kata/2-kyu/index.md) | [3 kyu](/kata/3-kyu/index.md) | [4 kyu](/kata/4-kyu/index.md) | [5 kyu](/kata/5-kyu/index.md) | [6 kyu](/kata/6-kyu/index.md) | [7 kyu](/kata/7-kyu/index.md) | [8 kyu](/kata/8-kyu/index.md) | [beta](/kata/beta/index.md) | [retired](/kata/retired/index.md) |
 |:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:---------------------------:|:---------------------------------:|
-| 0 | 1 | 2 | 26 | 48 | 432 | 591 | 219 | 56 | 79 |
+| 0 | 1 | 2 | 26 | 48 | 433 | 591 | 219 | 56 | 79 |
 
 **Note:** The source code is written in Java 17 and may use language features that are incompatible
 with Java 8, 11.

diff --git a/kata/6-kyu/index.md b/kata/6-kyu/index.md
@@ -398,6 +398,7 @@
 - [The Deaf Rats of Hamelin (2D)](the-deaf-rats-of-hamelin-2d)
 - [The difference between 11 and 21 in Ping-Pong](the-difference-between-11-and-21-in-ping-pong)
 - [The Enigma Machine - Part 1: The Plugboard](the-enigma-machine-part-1-the-plugboard)
+- [The latest clock](the-latest-clock)
 - [The lost beginning](the-lost-beginning)
 - [The Modulo-3 Sequence](the-modulo-3-sequence)
 - [The Office V - Find a Chair](the-office-v-find-a-chair)

diff --git a/kata/6-kyu/the-latest-clock/README.md b/kata/6-kyu/the-latest-clock/README.md
@@ -0,0 +1,17 @@
+# [The latest clock](https://www.codewars.com/kata/the-latest-clock "https://www.codewars.com/kata/58925dcb71f43f30cd00005f")
+
+Write a function which receives 4 digits and returns the latest time of day that can be built with those digits.
+
+The time should be in `HH:MM` format.
+
+Examples:
+
+```
+digits: 1, 9, 8, 3 => result: "19:38"
+digits: 9, 1, 2, 5 => result: "21:59" (19:25 is also a valid time, but 21:59 is later)
+```
+
+### Notes
+
+- Result should be a valid 24-hour time, between `00:00` and `23:59`.
+- Only inputs which have valid answers are tested.
diff --git a/kata/6-kyu/the-latest-clock/main/Kata.java b/kata/6-kyu/the-latest-clock/main/Kata.java
@@ -0,0 +1,16 @@
+import static java.util.Comparator.naturalOrder;
+import static java.util.stream.Stream.of;
+
+interface Kata {
+  static String latestClock(int a, int b, int c, int d) {
+    int[][] perms = {
+        {a, b, c, d}, {a, b, d, c}, {a, c, b, d}, {a, c, d, b}, {a, d, b, c}, {a, d, c, b},
+        {b, a, c, d}, {b, a, d, c}, {b, c, a, d}, {b, c, d, a}, {b, d, a, c}, {b, d, c, a},
+        {c, b, a, d}, {c, b, d, a}, {c, a, b, d}, {c, a, d, b}, {c, d, b, a}, {c, d, a, b},
+        {d, b, c, a}, {d, b, a, c}, {d, c, b, a}, {d, c, a, b}, {d, a, b, c}, {d, a, c, b}
+    };
+    return of(perms)
+        .map(p -> (p[0] == 2 && p[1] < 4 || p[0] < 2) && p[2] < 6 ? "" + p[0] + p[1] + ":" + p[2] + p[3] : "")
+        .max(naturalOrder()).orElseThrow();
+  }
+}
diff --git a/kata/6-kyu/the-latest-clock/test/LatestClockTest.java b/kata/6-kyu/the-latest-clock/test/LatestClockTest.java
@@ -0,0 +1,18 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class LatestClockTest {
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+      0, 0, 0, 0, 00:00
+      4, 0, 5, 0, 05:40
+      1, 9, 8, 3, 19:38
+      9, 1, 2, 5, 21:59
+      5, 2, 3, 9, 23:59
+      """)
+  void sample(int a, int b, int c, int d, String time) {
+    assertEquals(time, Kata.latestClock(a, b, c, d));
+  }
+}