Package g1401_1500.s1441_build_an_array_with_stack_operations

Class Solution

java.lang.Object

g1401_1500.s1441_build_an_array_with_stack_operations.Solution

public class Solution
extends Object

1441 - Build an Array With Stack Operations.<p>Easy</p> <p>You are given an array <code>target</code> and an integer <code>n</code>.</p> <p>In each iteration, you will read a number from <code>list = [1, 2, 3, ..., n]</code>.</p> <p>Build the <code>target</code> array using the following operations:</p> <ul> <li><code>&quot;Push&quot;</code>: Reads a new element from the beginning list, and pushes it in the array.</li> <li><code>&quot;Pop&quot;</code>: Deletes the last element of the array.</li> <li>If the target array is already built, stop reading more elements.</li> </ul> <p>Return <em>a list of the operations needed to build</em> <code>target</code>. The test cases are generated so that the answer is <strong>unique</strong>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> target = [1,3], n = 3</p> <p><strong>Output:</strong> [&ldquo;Push&rdquo;,&ldquo;Push&rdquo;,&ldquo;Pop&rdquo;,&ldquo;Push&rdquo;]</p> <p><strong>Explanation:</strong></p> <p>Read number 1 and automatically push in the array -> [1]</p> <p>Read number 2 and automatically push in the array then Pop it -> [1]</p> <p>Read number 3 and automatically push in the array -> [1,3]</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> target = [1,2,3], n = 3</p> <p><strong>Output:</strong> [&ldquo;Push&rdquo;,&ldquo;Push&rdquo;,&ldquo;Push&rdquo;]</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> target = [1,2], n = 4</p> <p><strong>Output:</strong> [&ldquo;Push&rdquo;,&ldquo;Push&rdquo;]</p> <p><strong>Explanation:</strong> You only need to read the first 2 numbers and stop.</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= target.length <= 100</code></li> <li><code>1 <= n <= 100</code></li> <li><code>1 <= target[i] <= n</code></li> <li><code>target</code> is strictly increasing.</li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
List<String>	buildArray(int[] target, int n)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

buildArray

public List<String> buildArray(int[] target,
 int n)