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Commite719179

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added solution and test cases for 449 (fishercoder1534#143)
1 parenta33a2bf commite719179

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‎src/main/java/com/fishercoder/solutions/_449.java

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Original file line numberDiff line numberDiff line change
@@ -2,6 +2,7 @@
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importcom.fishercoder.common.classes.TreeNode;
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importjava.util.Arrays;
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importjava.util.LinkedList;
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importjava.util.Queue;
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@@ -150,4 +151,43 @@ public TreeNode deserialize(String data) {
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returnroot;
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}
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}
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publicstaticclassSolution4 {
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privatestaticfinalStringNULL_SYMBOL ="X";
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privatestaticfinalStringDELIMITER =",";
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// Encodes a tree to a single string.
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publicStringserialize(TreeNoderoot) {
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// If we have a null symbol, encode it to NULL_SYMBOL
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if(root ==null)
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returnNULL_SYMBOL +DELIMITER;
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StringleftSubtree =serialize(root.left);
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StringrightSubtree =serialize(root.right);
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returnroot.val +DELIMITER +leftSubtree +rightSubtree;
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}
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// Decodes your encoded data to tree.
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publicTreeNodedeserialize(Stringdata) {
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Queue<String>nodesLeftToSerialize =newLinkedList<>();
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nodesLeftToSerialize.addAll(Arrays.asList(data.split(DELIMITER)));
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returndeserializeHelper(nodesLeftToSerialize);
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}
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privateTreeNodedeserializeHelper(Queue<String>nodesLeft){
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// remove the node
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StringnodeLeftToSerialize =nodesLeft.poll();
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// base case
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if(nodeLeftToSerialize.equals(NULL_SYMBOL)){
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returnnull;
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}
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TreeNodenewNode =newTreeNode(Integer.valueOf(nodeLeftToSerialize));
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newNode.left =deserializeHelper(nodesLeft);
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newNode.right =deserializeHelper(nodesLeft);
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returnnewNode;
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}
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}
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}

‎src/test/java/com/fishercoder/_449Test.java

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Original file line numberDiff line numberDiff line change
@@ -12,13 +12,15 @@ public class _449Test {
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privatestatic_449.Solution1solution1;
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privatestatic_449.Solution2solution2;
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privatestatic_449.Solution3solution3;
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privatestatic_449.Solution4solution4;
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privatestaticTreeNodeexpectedRoot;
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@BeforeClass
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publicstaticvoidsetup() {
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solution1 =new_449.Solution1();
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solution2 =new_449.Solution2();
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solution3 =new_449.Solution3();
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solution4 =new_449.Solution4();
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}
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@Before
@@ -34,6 +36,7 @@ public void test1() {
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assertEquals(expectedRoot.toString(),solution1.deserialize(solution1.serialize(expectedRoot)).toString());
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assertEquals(expectedRoot.toString(),solution2.deserialize(solution2.serialize(expectedRoot)).toString());
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assertEquals(expectedRoot.toString(),solution3.deserialize(solution3.serialize(expectedRoot)).toString());
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assertEquals(expectedRoot.toString(),solution4.deserialize(solution4.serialize(expectedRoot)).toString());
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}
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@Test
@@ -44,5 +47,6 @@ public void test2() {
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assertEquals(expectedRoot.toString(),solution1.deserialize(solution1.serialize(expectedRoot)).toString());
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assertEquals(expectedRoot.toString(),solution2.deserialize(solution2.serialize(expectedRoot)).toString());
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assertEquals(expectedRoot.toString(),solution3.deserialize(solution3.serialize(expectedRoot)).toString());
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assertEquals(expectedRoot.toString(),solution4.deserialize(solution4.serialize(expectedRoot)).toString());
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}
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}

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