feat: kata/sum-of-minimums (#789)

* docs: kata description

* feat: kata/sum-of-minimums

---------

Co-authored-by: ParanoidUser <5120290+ParanoidUser@users.noreply.github.com>

Author: github-actions[bot]

kata/7-kyu/index.md

@@ -529,6 +529,7 @@
 - [Sum of array singles](sum-of-array-singles "59f11118a5e129e591000134")
 - [Sum of Cubes](sum-of-cubes "59a8570b570190d313000037")
 - [Sum of differences between products and LCMs](sum-of-differences-between-products-and-lcms "56e56756404bb1c950000992")
+- [Sum of Minimums!](sum-of-minimums "5d5ee4c35162d9001af7d699")
 - [Sum of numbers from 0 to N](sum-of-numbers-from-0-to-n "56e9e4f516bcaa8d4f001763")
 - [Sum of Odd Cubed Numbers](sum-of-odd-cubed-numbers "580dda86c40fa6c45f00028a")
 - [Sum of odd numbers](sum-of-odd-numbers "55fd2d567d94ac3bc9000064")

kata/7-kyu/sum-of-minimums/README.md

@@ -0,0 +1,16 @@
+# [Sum of Minimums!](https://www.codewars.com/kata/sum-of-minimums "https://www.codewars.com/kata/5d5ee4c35162d9001af7d699")
+
+Given a 2D (nested) list (array, vector, …) of size `m * n`, your task is to find the sum of the minimum values in each row.
+
+For Example:
+
+```
+[ [ 1, 2, 3, 4, 5 ] # minimum value of row is 1
+, [ 5, 6, 7, 8, 9 ] # minimum value of row is 5
+, [ 20, 21, 34, 56, 100 ] # minimum value of row is 20
+]
+```
+
+So the function should return `26` because the sum of the minimums is `1 + 5 + 20 = 26`.
+
+Note: You will always be given a non-empty list containing positive values.

kata/7-kyu/sum-of-minimums/main/Kata.java

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+import static java.util.Arrays.stream;
+
+interface Kata {
+  static int sumOfMinimums(int[][] arr) {
+    return stream(arr).mapToInt(row -> stream(row).min().orElse(0)).sum();
+  }
+}

kata/7-kyu/sum-of-minimums/test/SumOfMinimumsTest.java

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+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.params.provider.Arguments.arguments;
+
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class SumOfMinimumsTest {
+  private static Stream<Arguments> testData() {
+    return Stream.of(
+        arguments(new int[][]{{7, 9, 8, 6, 2}, {6, 3, 5, 4, 3}, {5, 8, 7, 4, 5}}, 9),
+        arguments(new int[][]{{11, 12, 14, 54}, {67, 89, 90, 56}, {7, 9, 4, 3}, {9, 8, 6, 7}}, 76));
+  }
+
+  @ParameterizedTest
+  @MethodSource("testData")
+  void sample(int[][] arr, int expected) {
+    assertEquals(expected, Kata.sumOfMinimums(arr));
+  }
+}