Commit 92297ae

author

Shuo

authored

Merge pull request #420 from openset/develop

Add: Symmetric Tree

2 parents afc46ee + bcf535d commit 92297aeCopy full SHA for 92297ae

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Lines changed: 23 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,24 @@`
`1`	`1`	`package symmetric_tree`
	`2`	`+`
	`3`	`+import . "github.com/openset/leetcode/internal/kit"`
	`4`	`+`
	`5`	`+/**`
	`6`	`+ * Definition for a binary tree node.`
	`7`	`+ * type TreeNode struct {`
	`8`	`+ * Val int`
	`9`	`+ * Left *TreeNode`
	`10`	`+ * Right *TreeNode`
	`11`	`+ * }`
	`12`	`+ */`
	`13`	`+func isSymmetric(root *TreeNode) bool {`
	`14`	`+ return isMirror(root, root)`
	`15`	`+}`
	`16`	`+`
	`17`	`+func isMirror(t1, t2 *TreeNode) bool {`
	`18`	`+ if t1 == nil && t2 == nil {`
	`19`	`+ return true`
	`20`	`+ } else if t1 == nil \|\| t2 == nil {`
	`21`	`+ return false`
	`22`	`+ }`
	`23`	`+ return t1.Val == t2.Val && isMirror(t1.Left, t2.Right) && isMirror(t1.Right, t2.Left)`
	`24`	`+}`

Lines changed: 30 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,31 @@`
`1`	`1`	`package symmetric_tree`
	`2`	`+`
	`3`	`+import (`
	`4`	`+ "testing"`
	`5`	`+`
	`6`	`+ . "github.com/openset/leetcode/internal/kit"`
	`7`	`+)`
	`8`	`+`
	`9`	`+type caseType struct {`
	`10`	`+ input []int`
	`11`	`+ expected bool`
	`12`	`+}`
	`13`	`+`
	`14`	`+func TestIsSymmetric(t *testing.T) {`
	`15`	`+ tests := [...]caseType{`
	`16`	`+ {`
	`17`	`+ input: []int{1, 2, 2, 3, 4, 4, 3},`
	`18`	`+ expected: true,`
	`19`	`+ },`
	`20`	`+ {`
	`21`	`+ input: []int{1, 2, 2, NULL, 3, NULL, 3},`
	`22`	`+ expected: false,`
	`23`	`+ },`
	`24`	`+ }`
	`25`	`+ for _, tc := range tests {`
	`26`	`+ output := isSymmetric(SliceInt2TreeNode(tc.input))`
	`27`	`+ if output != tc.expected {`
	`28`	`+ t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)`
	`29`	`+ }`
	`30`	`+ }`
	`31`	`+}`

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