Add AssignmentUsingBitmask algorithm (#5792)

src/test/java/com/thealgorithms/dynamicprogramming/AssignmentUsingBitmaskTest.java

@@ -0,0 +1,54 @@
+package com.thealgorithms.dynamicprogramming;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Arrays;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+
+public final class AssignmentUsingBitmaskTest {
+
+    @Test
+    public void testCountNoOfWays() {
+        int totalTasks = 5;
+
+        List<List<Integer>> taskPerformed = Arrays.asList(Arrays.asList(1, 3, 4), Arrays.asList(1, 2, 5), Arrays.asList(3, 4));
+
+        AssignmentUsingBitmask assignment = new AssignmentUsingBitmask(taskPerformed, totalTasks);
+        int ways = assignment.countNoOfWays();
+        assertEquals(10, ways);
+    }
+
+    @Test
+    public void testNoPossibleAssignments() {
+        int totalTasks = 3;
+
+        List<List<Integer>> taskPerformed = Arrays.asList(Arrays.asList(2), Arrays.asList(3));
+
+        AssignmentUsingBitmask assignment = new AssignmentUsingBitmask(taskPerformed, totalTasks);
+        int ways = assignment.countNoOfWays();
+        assertEquals(1, ways);
+    }
+
+    @Test
+    public void testSinglePersonMultipleTasks() {
+        int totalTasks = 3;
+
+        List<List<Integer>> taskPerformed = Arrays.asList(Arrays.asList(1, 2, 3));
+
+        AssignmentUsingBitmask assignment = new AssignmentUsingBitmask(taskPerformed, totalTasks);
+        int ways = assignment.countNoOfWays();
+        assertEquals(3, ways);
+    }
+
+    @Test
+    public void testMultiplePeopleSingleTask() {
+        int totalTasks = 1;
+
+        List<List<Integer>> taskPerformed = Arrays.asList(Arrays.asList(1), Arrays.asList(1));
+
+        AssignmentUsingBitmask assignment = new AssignmentUsingBitmask(taskPerformed, totalTasks);
+        int ways = assignment.countNoOfWays();
+        assertEquals(0, ways);
+    }
+}