solves build an array with stack operations

Author: anishLearnsToCode

README.md

@@ -366,7 +366,7 @@
 | 1431 | [Kids With The Greatest Number Of Candies](https://leetcode.com/problems/kids-with-the-greatest-number-of-candies)                                   |                                                       [![Java](assets/java.png)](src/KidsWithTheGreatestNumberOfCandies.java)                                                        |                                                                                                                                   |
 | 1436 | [Destination City](https://leetcode.com/problems/destination-city)                                                                                   |                                                                 [![Java](assets/java.png)](src/DestinationCity.java)                                                                 |                                                                                                                                   |
 | 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)                |                                                        [![Java](assets/java.png)](src/CheckIfAll1sAreAtLeastKPlacesAway.java)                                                        |                                                                                                                                   |
-| 1441 | [Build An Array With Stack Operation](https://leetcode.com/problems/build-an-array-with-stack-operations)                                            |                                                                                                                                                                                      |                                                                                                                                   |
+| 1441 | [Build An Array With Stack Operation](https://leetcode.com/problems/build-an-array-with-stack-operations)                                            |                                                         [![Java](assets/java.png)](src/BuildAnArrayWithStackOperations.java)                                                         |                                                                                                                                   |
 | 1446 | [Consecutive Characters](https://leetcode.com/problems/consecutive-characters)                                                                       |                                                                                                                                                                                      |                                                                                                                                   |
 | 1450 | [Number of Students Doing Homework at Given Time](https://leetcode.com/problems/number-of-students-doing-homework-at-a-given-time)                   |                                                                                                                                                                                      |                                                                                                                                   |
 | 1455 | [Check If Word Occurs as Prefix of any Word in Sentence](https://leetcode.com/problems/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence) |                                                                                                                                                                                      |                                                                                                                                   |

src/BuildAnArrayWithStackOperations.java

@@ -0,0 +1,28 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class BuildAnArrayWithStackOperations {
+    private static final String PUSH = "Push";
+    private static final String POP = "Pop";
+
+    public List<String> buildArray(int[] target, int n) {
+        List<String> result = new ArrayList<>();
+        for (int index = 0, lastNumber = 0 ; index < target.length ; index++) {
+            popKNumbers(result, target[index] - 1 - lastNumber);
+            pushCurrentNumber(result);
+            lastNumber = target[index];
+        }
+        return result;
+    }
+
+    private void popKNumbers(List<String> list, int k) {
+        while (k-- > 0) {
+            list.add(PUSH);
+            list.add(POP);
+        }
+    }
+
+    private void pushCurrentNumber(List<String> list) {
+        list.add(PUSH);
+    }
+}