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add solution and test cases for 449#143

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Merged
fishercoder1534 merged 1 commit intofishercoder1534:masterfromashmichheda:449
Jan 9, 2021
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40 changes: 40 additions & 0 deletionssrc/main/java/com/fishercoder/solutions/_449.java
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Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,7 @@

importcom.fishercoder.common.classes.TreeNode;

importjava.util.Arrays;
importjava.util.LinkedList;
importjava.util.Queue;

Expand DownExpand Up@@ -150,4 +151,43 @@ public TreeNode deserialize(String data) {
returnroot;
}
}
publicstaticclassSolution4 {
privatestaticfinalStringNULL_SYMBOL ="X";
privatestaticfinalStringDELIMITER =",";

// Encodes a tree to a single string.
publicStringserialize(TreeNoderoot) {

// If we have a null symbol, encode it to NULL_SYMBOL
if(root ==null)
returnNULL_SYMBOL +DELIMITER;

StringleftSubtree =serialize(root.left);
StringrightSubtree =serialize(root.right);

returnroot.val +DELIMITER +leftSubtree +rightSubtree;
}

// Decodes your encoded data to tree.
publicTreeNodedeserialize(Stringdata) {

Queue<String>nodesLeftToSerialize =newLinkedList<>();
nodesLeftToSerialize.addAll(Arrays.asList(data.split(DELIMITER)));
returndeserializeHelper(nodesLeftToSerialize);

}
privateTreeNodedeserializeHelper(Queue<String>nodesLeft){

// remove the node
StringnodeLeftToSerialize =nodesLeft.poll();
// base case
if(nodeLeftToSerialize.equals(NULL_SYMBOL)){
returnnull;
}
TreeNodenewNode =newTreeNode(Integer.valueOf(nodeLeftToSerialize));
newNode.left =deserializeHelper(nodesLeft);
newNode.right =deserializeHelper(nodesLeft);
returnnewNode;
}
}
}
4 changes: 4 additions & 0 deletionssrc/test/java/com/fishercoder/_449Test.java
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Original file line numberDiff line numberDiff line change
Expand Up@@ -12,13 +12,15 @@ public class _449Test {
private static _449.Solution1 solution1;
private static _449.Solution2 solution2;
private static _449.Solution3 solution3;
private static _449.Solution4 solution4;
private static TreeNode expectedRoot;

@BeforeClass
public static void setup() {
solution1 = new _449.Solution1();
solution2 = new _449.Solution2();
solution3 = new _449.Solution3();
solution4 = new _449.Solution4();
}

@Before
Expand All@@ -34,6 +36,7 @@ public void test1() {
assertEquals(expectedRoot.toString(), solution1.deserialize(solution1.serialize(expectedRoot)).toString());
assertEquals(expectedRoot.toString(), solution2.deserialize(solution2.serialize(expectedRoot)).toString());
assertEquals(expectedRoot.toString(), solution3.deserialize(solution3.serialize(expectedRoot)).toString());
assertEquals(expectedRoot.toString(), solution4.deserialize(solution4.serialize(expectedRoot)).toString());
}

@Test
Expand All@@ -44,5 +47,6 @@ public void test2() {
assertEquals(expectedRoot.toString(), solution1.deserialize(solution1.serialize(expectedRoot)).toString());
assertEquals(expectedRoot.toString(), solution2.deserialize(solution2.serialize(expectedRoot)).toString());
assertEquals(expectedRoot.toString(), solution3.deserialize(solution3.serialize(expectedRoot)).toString());
assertEquals(expectedRoot.toString(), solution4.deserialize(solution4.serialize(expectedRoot)).toString());
}
}
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