solves #2744: FindMaximumNumberOfStringPair in java

Author: anishLearnsToCode

README.txt

@@ -833,7 +833,7 @@
 | 2729 | [Check if The Number is Fascinating](https://leetcode.com/problems/check-if-the-number-is-fascinating)                                                                 |                                                                                   [![Java](assets/java.png)](src/CheckIfTheNumberIsFascinating.java)                                                                                                                                               |                                                                                                                                   |
 | 2733 | [Neither Minimum nor Maximum](https://leetcode.com/problems/neither-minimum-nor-maximum)                                                                               |                                                                                   [![Java](assets/java.png)](src/NeitherMinimumNorMaximum.java)                                                                                                                                               |                                                                                                                                   |
 | 2739 | [Total Distance Traveled](https://leetcode.com/problems/total-distance-traveled)                                                                                       |                                                                                   [![Java](assets/java.png)](src/TotalDistanceTraveled.java)                                                                                                                                               |                                                                                                                                   |
-| 2744 | [Find Maximum Number of String Pairs](https://leetcode.com/problems/find-maximum-number-of-string-pairs)                                                               |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 2744 | [Find Maximum Number of String Pairs](https://leetcode.com/problems/find-maximum-number-of-string-pairs)                                                               |                                                                                   [![Java](assets/java.png)](src/FindMaximumNumberOfStringPairs.java)                                                                                                                                               |                                                                                                                                   |
 | 2748 | [Number of Beautiful Pairs](https://leetcode.com/problems/number-of-beautiful-pairs)                                                                                   |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2760 | [Longest Even Odd Subarray With Threshold](https://leetcode.com/problems/longest-even-odd-subarray-with-threshold)                                                     |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2765 | [Longest Alternating Subarray](https://leetcode.com/problems/longest-alternating-subarray)                                                                             |                                                                                                                                                                                                                                  |                                                                                                                                   |

src/FindMaximumNumberOfStringPairs.java

@@ -0,0 +1,23 @@
+// https://leetcode.com/problems/find-maximum-number-of-string-pairs
+// T: O(N * |s|)
+// S: O(N * |s|)
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class FindMaximumNumberOfStringPairs {
+    public int maximumNumberOfStringPairs(String[] words) {
+        final Set<String> strings = new HashSet<>();
+        int pairs = 0;
+        for (String word : words) {
+            final String reversed = new StringBuilder(word).reverse().toString();
+            if (strings.contains(reversed)) {
+                pairs++;
+                strings.remove(reversed);
+            } else {
+                strings.add(word);
+            }
+        }
+        return pairs;
+    }
+}