feat: kata/time-math

docs/README.md

@@ -1,7 +1,7 @@
 # Codewars Handbook ☕️🚀
 
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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 | 440 | 605 | 227 | 56 | 82 |
+| 0 | 1 | 2 | 26 | 48 | 441 | 605 | 227 | 56 | 82 |
 
 **Note:** The source code is written in Java 17 and may use language features that are incompatible
 with Java 8, 11.

kata/6-kyu/index.md

@@ -415,6 +415,7 @@
 - [The Walker](the-walker)
 - [Throw without throwing](throw-without-throwing)
 - [Tic-Tac-Toe-like table Generator](tic-tac-toe-like-table-generator)
+- [Time Math](time-math)
 - [Tortoise racing](tortoise-racing)
 - [Traffic Lights - one car](traffic-lights-one-car)
 - [Transform To Prime](transform-to-prime)

kata/6-kyu/time-math/README.md

@@ -0,0 +1,10 @@
+# [Time Math](https://www.codewars.com/kata/time-math "https://www.codewars.com/kata/5aceae374d9fd1266f0000f0")
+
+Given two times in hours, minutes, and seconds (ie '15:04:24'), add or subtract them. This is a 24-hour clock. Output should be two digits
+for all numbers: hours, minutes, seconds (ie '04:02:09').
+
+```
+timeMath('01:24:31', '+', '02:16:05') === '03:40:36'
+
+timeMath('01:24:31', '-', '02:31:41') === '22:52:50'
+```

kata/6-kyu/time-math/main/Solution.java

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+import java.time.LocalTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.ResolverStyle;
+
+interface Solution {
+  static String timeMath(String time1, String op, String time2) {
+    DateTimeFormatter format = DateTimeFormatter.ofPattern("HH:mm:ss").withResolverStyle(ResolverStyle.LENIENT);
+    LocalTime t1 = LocalTime.parse(time1, format);
+    LocalTime t2 = LocalTime.parse(time2, format);
+
+    return op.equals("+") ?
+        t1.plusHours(t2.getHour()).plusMinutes(t2.getMinute()).plusSeconds(t2.getSecond()).format(format) :
+        t1.minusHours(t2.getHour()).minusMinutes(t2.getMinute()).minusSeconds(t2.getSecond()).format(format);
+  }
+}

kata/6-kyu/time-math/test/SolutionTest.java

@@ -0,0 +1,27 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class SolutionTest {
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+      01:24:31, 02:16:05, 03:40:36
+      01:24:31, 22:35:28, 23:59:59
+      00:00:01, 23:59:59, 00:00:00
+      13:48:52, 13:47:53, 03:36:45
+      """)
+  void add(String time1, String time2, String result) {
+    assertEquals(result, Solution.timeMath(time1, "+", time2));
+  }
+
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+      11:24:31, 11:24:31, 00:00:00
+      11:24:31, 03:15:28, 08:09:03
+      00:00:01, 00:00:02, 23:59:59
+      """)
+  void subtract(String time1, String time2, String result) {
+    assertEquals(result, Solution.timeMath(time1, "-", time2));
+  }
+}