resolve #139-max-min 문제풀이 및 문서추가

Algorithms/Greedy/max-min.js

@@ -0,0 +1,19 @@
+/**
+ * @title Max Min
+ * @difficulty Median
+ * @link https://www.hackerrank.com/challenges/angry-children/problem
+ */
+
+const getUnfairness = (arr, length) => arr[length - 1] - arr[0];
+
+function maxMin(subarrLength, arr) {
+  const {length: arrLength} = arr;
+  const sorted = arr.sort((a, b) => a - b);
+
+  let unfairness = Infinity;
+  for (let startIdx = 0; startIdx <= arrLength - subarrLength; startIdx++) {
+    unfairness = Math.min(unfairness, getUnfairness(sorted.slice(startIdx, startIdx + subarrLength), subarrLength));
+  }
+
+  return unfairness;
+}

README.md

@@ -64,6 +64,9 @@ Generates the README.md.
 | --- | --- | --- |
 | Easy | [2D Array - DS](https://www.hackerrank.com/challenges/2d-array/problem) | [Solution](./Interview-Preparation-Kit/Arrays/2d-array-ds.js)|
 | Easy | [Left Rotation](https://www.hackerrank.com/challenges/ctci-array-left-rotation/problem) | [Solution](./Interview-Preparation-Kit/Arrays/left-rotation.js)|
+#### Strings
+| Difficulty | Problem | Solution |
+| --- | --- | --- |
 #### Warm-up-Challenges
 | Difficulty | Problem | Solution |
 | --- | --- | --- |
@@ -78,6 +81,10 @@ Generates the README.md.
 | Difficulty | Problem | Solution |
 | --- | --- | --- |
 | Medium | [New Year Chaos](https://www.hackerrank.com/challenges/new-year-chaos/problem) | [Solution](./Algorithms/Constructive-Algorithms/new-year-chaos.js)|
+#### Greedy
+| Difficulty | Problem | Solution |
+| --- | --- | --- |
+| Median | [Fraudulent Activity Notifications](https://www.hackerrank.com/challenges/fraudulent-activity-notifications/problem) | [Solution](./Algorithms/Greedy/max-min.js)|
 #### Sorting
 | Difficulty | Problem | Solution |
 | --- | --- | --- |