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Commit5b7b8b4

Browse files
refactor 101
1 parent3f164ff commit5b7b8b4

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2 files changed

+50
-19
lines changed

2 files changed

+50
-19
lines changed

‎src/main/java/com/fishercoder/solutions/_101.java

Lines changed: 25 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -18,4 +18,29 @@ private boolean isSymmetric(TreeNode left, TreeNode right) {
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returnleft.val ==right.val &&isSymmetric(left.left,right.right) &&isSymmetric(left.right,right.left);
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}
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}
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publicstaticclassSolution2 {
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/**
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* The same as the above solution, just a bit more verbose.
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*/
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publicbooleanisSymmetric(TreeNoderoot) {
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if (root ==null) {
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returntrue;
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}
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returnisSymmetric(root.left,root.right);
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}
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privatebooleanisSymmetric(TreeNodeleft,TreeNoderight) {
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if (left ==null &&right ==null) {
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returntrue;
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}elseif (left ==null ||right ==null) {
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returnfalse;
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}
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if (left.val ==right.val) {
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returnisSymmetric(left.left,right.right) &&isSymmetric(left.right,right.left);
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}else {
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returnfalse;
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}
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}
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}
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}

‎src/test/java/com/fishercoder/_101Test.java

Lines changed: 25 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -3,30 +3,36 @@
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importcom.fishercoder.common.classes.TreeNode;
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importcom.fishercoder.common.utils.TreeUtils;
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importcom.fishercoder.solutions._101;
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importjava.util.Arrays;
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importorg.junit.BeforeClass;
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importorg.junit.Test;
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1012
importstaticorg.junit.Assert.assertEquals;
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publicclass_101Test {
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privatestatic_101.Solution1solution1;
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privatestaticTreeNoderoot;
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@BeforeClass
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publicstaticvoidsetup() {
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solution1 =new_101.Solution1();
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}
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@Test
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publicvoidtest1() {
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root =TreeUtils.constructBinaryTree(Arrays.asList(1,2,2,3,4,4,3));
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assertEquals(true,solution1.isSymmetric(root));
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}
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@Test
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publicvoidtest2() {
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root =TreeUtils.constructBinaryTree(Arrays.asList(1,2,2,null,3,null,3));
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assertEquals(false,solution1.isSymmetric(root));
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}
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privatestatic_101.Solution1solution1;
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privatestatic_101.Solution2solution2;
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privatestaticTreeNoderoot;
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@BeforeClass
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publicstaticvoidsetup() {
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solution1 =new_101.Solution1();
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solution2 =new_101.Solution2();
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}
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@Test
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publicvoidtest1() {
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root =TreeUtils.constructBinaryTree(Arrays.asList(1,2,2,3,4,4,3));
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assertEquals(true,solution1.isSymmetric(root));
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assertEquals(true,solution2.isSymmetric(root));
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}
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@Test
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publicvoidtest2() {
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root =TreeUtils.constructBinaryTree(Arrays.asList(1,2,2,null,3,null,3));
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assertEquals(false,solution1.isSymmetric(root));
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assertEquals(false,solution2.isSymmetric(root));
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}
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}

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