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345 reverse vowels resolved. #17
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77 changes: 77 additions & 0 deletions
src/0345_reverse_vowels_of_a_string/reverse_vowels.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| /* | ||
| 345. Reverse Vowels of a String | ||
| https://leetcode.com/problems/reverse-vowels-of-a-string/ | ||
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| Write a function that takes a string as input and reverse only the vowels of a string. | ||
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| */ | ||
| // time: 2018年12月26日 | ||
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| package reversevowels | ||
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| // time complexity: O(n) | ||
| // space complexity: O(1) | ||
| func reverseVowels(s string) string { | ||
| var ( | ||
| l int | ||
| r = len(s) - 1 | ||
| ) | ||
|
|
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| for r > l { | ||
| for r >= 0 && !isVowel(s[r]) { | ||
| r-- | ||
| } | ||
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| for l < len(s) && !isVowel(s[l]) { | ||
| l++ | ||
| } | ||
|
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| if l >= r { | ||
| break | ||
| } | ||
| charL := s[l] | ||
| charR := s[r] | ||
| s = s[:r] + string(charL) + s[r+1:] | ||
| s = s[:l] + string(charR) + s[l+1:] | ||
| r-- | ||
| l++ | ||
| } | ||
| return s | ||
| } | ||
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| // time complexity: O(n) | ||
| // space complexity: O(n) | ||
| func reverseVowels1(s string) string { | ||
| bytes := []byte(s) | ||
| var ( | ||
| l int | ||
| r = len(bytes) - 1 | ||
| ) | ||
| for r > l { | ||
| for r >= 0 && !isVowel(s[r]) { | ||
| r-- | ||
| } | ||
| for l < len(bytes) && !isVowel(s[l]) { | ||
| l++ | ||
| } | ||
| if l >= r { | ||
| break | ||
| } | ||
|
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| bytes[l], bytes[r] = bytes[r], bytes[l] | ||
| l++ | ||
| r-- | ||
| } | ||
| return string(bytes) | ||
| } | ||
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| func isVowel(char byte) bool { | ||
| vowels := [...]byte{'a', 'o', 'e', 'i', 'u', 'A', 'O', 'E', 'I', 'U'} | ||
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| for _, k := range vowels { | ||
| if char == k { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } |
47 changes: 47 additions & 0 deletions
src/0345_reverse_vowels_of_a_string/reverse_vowels_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package reversevowels | ||
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| import "testing" | ||
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| func TestReverseVowels(t *testing.T) { | ||
| testCases := []string{ | ||
| "hello", | ||
| "leetcode", | ||
| "aA", | ||
| "a.b,.", | ||
| } | ||
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| expected := []string{ | ||
| "holle", | ||
| "leotcede", | ||
| "Aa", | ||
| "a.b,.", | ||
| } | ||
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| for index, data := range testCases { | ||
| if res := reverseVowels(data); res != expected[index] { | ||
| t.Errorf("expected %s, got %s", expected[index], res) | ||
| } | ||
| } | ||
| } | ||
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| func TestReverseVowels1(t *testing.T) { | ||
| testCases := []string{ | ||
| "hello", | ||
| "leetcode", | ||
| "aA", | ||
| "a.b,.", | ||
| } | ||
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| expected := []string{ | ||
| "holle", | ||
| "leotcede", | ||
| "Aa", | ||
| "a.b,.", | ||
| } | ||
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| for index, data := range testCases { | ||
| if res := reverseVowels1(data); res != expected[index] { | ||
| t.Errorf("expected %s, got %s", expected[index], res) | ||
| } | ||
| } | ||
| } |
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