Commit 26e7b76

author

Shuo

authored

Merge pull request #582 from openset/develop

Add: Longest Palindromic Substring

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Lines changed: 19 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,20 @@`
`1`	`1`	`package longest_palindromic_substring`
	`2`	`+`
	`3`	`+func longestPalindrome(s string) string {`
	`4`	`+ start, maxLen, l := 0, 0, len(s)`
	`5`	`+ for i := 0; i < l; i++ {`
	`6`	`+ expandAroundCenter(s, i, i, &start, &maxLen)`
	`7`	`+ expandAroundCenter(s, i, i+1, &start, &maxLen)`
	`8`	`+ }`
	`9`	`+ return s[start : start+maxLen]`
	`10`	`+}`
	`11`	`+`
	`12`	`+func expandAroundCenter(s string, l, r int, start, maxLen *int) {`
	`13`	`+ for l >= 0 && r < len(s) && s[l] == s[r] {`
	`14`	`+ l, r = l-1, r+1`
	`15`	`+ }`
	`16`	`+ if r-l-1 > *maxLen {`
	`17`	`+ *maxLen = r - l - 1`
	`18`	`+ *start = l + 1`
	`19`	`+ }`
	`20`	`+}`

Lines changed: 38 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,39 @@`
`1`	`1`	`package longest_palindromic_substring`
	`2`	`+`
	`3`	`+import "testing"`
	`4`	`+`
	`5`	`+type caseType struct {`
	`6`	`+ input string`
	`7`	`+ expected string`
	`8`	`+}`
	`9`	`+`
	`10`	`+func TestLongestPalindrome(t *testing.T) {`
	`11`	`+ tests := [...]caseType{`
	`12`	`+ {`
	`13`	`+ input: "babad",`
	`14`	`+ expected: "bab",`
	`15`	`+ },`
	`16`	`+ {`
	`17`	`+ input: "cbbd",`
	`18`	`+ expected: "bb",`
	`19`	`+ },`
	`20`	`+ {`
	`21`	`+ input: "",`
	`22`	`+ expected: "",`
	`23`	`+ },`
	`24`	`+ {`
	`25`	`+ input: "a",`
	`26`	`+ expected: "a",`
	`27`	`+ },`
	`28`	`+ {`
	`29`	`+ input: "abbba",`
	`30`	`+ expected: "abbba",`
	`31`	`+ },`
	`32`	`+ }`
	`33`	`+ for _, tc := range tests {`
	`34`	`+ output := longestPalindrome(tc.input)`
	`35`	`+ if output != tc.expected {`
	`36`	`+ t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)`
	`37`	`+ }`
	`38`	`+ }`
	`39`	`+}`

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