[LEET-3450] add 3450

Author: fishercoder1534

paginated_contents/algorithms/4th_thousand/README.md

@@ -4,6 +4,7 @@
 | 3491 | [Phone Number Prefix](https://leetcode.com/problems/phone-number-prefix/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3491.java) |                                                                               | Easy       |
 | 3477 | [Fruits Into Baskets II](https://leetcode.com/problems/fruits-into-baskets-ii/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3477.java) |                                                                               | Easy       |
 | 3471 | [Find the Largest Almost Missing Integer](https://leetcode.com/problems/find-the-largest-almost-missing-integer/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3471.java) |                                                                               | Easy       |
+| 3450 | [Maximum Students on a Single Bench](https://leetcode.com/problems/maximum-students-on-a-single-bench/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3450.java) |                                                                               | Easy       |
 | 3402 | [Minimum Operations to Make Columns Strictly Increasing](https://leetcode.com/problems/minimum-operations-to-make-columns-strictly-increasing/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3402.java) |                                                                               | Easy       |
 | 3396 | [Minimum Number of Operations to Make Elements in Array Distinct](https://leetcode.com/problems/minimum-number-of-operations-to-make-elements-in-array-distinct/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3396.java) |                                                                               | Easy       |
 | 3392 | [Count Subarrays of Length Three With a Condition](https://leetcode.com/problems/count-subarrays-of-length-three-with-a-condition/)                                                               | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3392.java) |                                                                               | Easy       |

src/main/java/com/fishercoder/solutions/fourththousand/_3450.java

@@ -0,0 +1,24 @@
+package com.fishercoder.solutions.fourththousand;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+public class _3450 {
+    public static class Solution1 {
+        public int maxStudentsOnBench(int[][] students) {
+            Map<Integer, Set<Integer>> map = new HashMap<>();
+            for (int[] student : students) {
+                Set<Integer> set = map.getOrDefault(student[1], new HashSet<>());
+                set.add(student[0]);
+                map.put(student[1], set);
+            }
+            int result = 0;
+            for (Map.Entry<Integer, Set<Integer>> entry : map.entrySet()) {
+                result = Math.max(result, entry.getValue().size());
+            }
+            return result;
+        }
+    }
+}

src/test/java/com/fishercoder/fourththousand/_3450Test.java

@@ -0,0 +1,22 @@
+package com.fishercoder.fourththousand;
+
+import com.fishercoder.common.utils.CommonUtils;
+import com.fishercoder.solutions.fourththousand._3450;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class _3450Test {
+    private _3450.Solution1 solution1;
+
+    @BeforeEach
+    public void setup() {
+        solution1 = new _3450.Solution1();
+    }
+
+    @Test
+    public void test1() {
+        assertEquals(3, solution1.maxStudentsOnBench(CommonUtils.convertLeetCodeIrregularLengths2DArrayInputIntoJavaArray("[1,2],[2,2],[3,3],[1,3],[2,3]")));
+    }
+}