add 1441

Author: fishercoder1534

README.md

@@ -8,6 +8,7 @@ _If you like this project, please leave me a star._ ★
 
 |  #  |      Title     |   Solutions   | Video  | Difficulty  | Tag                   
 |-----|----------------|---------------|--------|-------------|-------------
+|1441|[Build an Array With Stack Operations](https://leetcode.com/problems/build-an-array-with-stack-operations/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1441.java) | |Easy|Stack|
 |1437|[Check If All 1's Are at Least Length K Places Away](https://leetcode.com/problems/check-if-all-1s-are-at-least-length-k-places-away/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1437.java) | |Medium|Array|
 |1436|[Destination City](https://leetcode.com/problems/destination-city/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1436.java) | |Easy|String|
 |1432|[Max Difference You Can Get From Changing an Integer](https://leetcode.com/problems/max-difference-you-can-get-from-changing-an-integer/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1432.java) | |Medium|String|

src/main/java/com/fishercoder/solutions/_1441.java

@@ -0,0 +1,31 @@
+package com.fishercoder.solutions;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+public class _1441 {
+    public static class Solution1 {
+        public List<String> buildArray(int[] target, int n) {
+            List<String> result = new ArrayList<>();
+            Set<Integer> set = new HashSet<>();
+            for (int i : target) {
+                set.add(i);
+            }
+            int max = target[target.length - 1];
+            for (int i = 1; i <= n; i++) {
+                if (!set.contains(i)) {
+                    result.add("Push");
+                    result.add("Pop");
+                } else {
+                    result.add("Push");
+                }
+                if (i == max) {
+                    break;
+                }
+            }
+            return result;
+        }
+    }
+}

src/test/java/com/fishercoder/_1441Test.java

@@ -0,0 +1,26 @@
+package com.fishercoder;
+
+import com.fishercoder.solutions._1441;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.util.Arrays;
+
+import static junit.framework.TestCase.assertEquals;
+
+public class _1441Test {
+    private static _1441.Solution1 solution1;
+    private static int[] target;
+
+    @BeforeClass
+    public static void setup() {
+        solution1 = new _1441.Solution1();
+    }
+
+    @Test
+    public void test1() {
+        target = new int[]{1, 3};
+        assertEquals(Arrays.asList("Push", "Push", "Pop", "Push"), solution1.buildArray(target, 3));
+    }
+
+}