Commit 5328f9f

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Add: Palindrome Linked List

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Lines changed: 27 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,28 @@`
`1`	`1`	`package palindrome_linked_list`
	`2`	`+`
	`3`	`+import . "github.com/openset/leetcode/internal/kit"`
	`4`	`+`
	`5`	`+/**`
	`6`	`+ * Definition for singly-linked list.`
	`7`	`+ * type ListNode struct {`
	`8`	`+ * Val int`
	`9`	`+ * Next *ListNode`
	`10`	`+ * }`
	`11`	`+ */`
	`12`	`+func isPalindrome(head *ListNode) bool {`
	`13`	`+ var prev *ListNode`
	`14`	`+ slow, fast := head, head`
	`15`	`+ for fast != nil && fast.Next != nil {`
	`16`	`+ slow, fast = slow.Next, fast.Next.Next`
	`17`	`+ }`
	`18`	`+ for slow != nil {`
	`19`	`+ prev, slow, slow.Next = slow, slow.Next, prev`
	`20`	`+ }`
	`21`	`+ for head != nil && prev != nil {`
	`22`	`+ if head.Val != prev.Val {`
	`23`	`+ return false`
	`24`	`+ }`
	`25`	`+ head, prev = head.Next, prev.Next`
	`26`	`+ }`
	`27`	`+ return true`
	`28`	`+}`

Lines changed: 34 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,35 @@`
`1`	`1`	`package palindrome_linked_list`
	`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 TestIsPalindrome(t *testing.T) {`
	`15`	`+ tests := [...]caseType{`
	`16`	`+ {`
	`17`	`+ input: []int{1, 2},`
	`18`	`+ expected: false,`
	`19`	`+ },`
	`20`	`+ {`
	`21`	`+ input: []int{1, 2, 1},`
	`22`	`+ expected: true,`
	`23`	`+ },`
	`24`	`+ {`
	`25`	`+ input: []int{1, 2, 2, 1},`
	`26`	`+ expected: true,`
	`27`	`+ },`
	`28`	`+ }`
	`29`	`+ for _, tc := range tests {`
	`30`	`+ output := isPalindrome(SliceInt2ListNode(tc.input))`
	`31`	`+ if output != tc.expected {`
	`32`	`+ t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)`
	`33`	`+ }`
	`34`	`+ }`
	`35`	`+}`

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