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344 reverse string resolved. #16
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41 changes: 41 additions & 0 deletions
src/0344_reverse_string/reverse_string.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| /* | ||
| 344. Reverse String | ||
| https://leetcode.com/problems/reverse-string/ | ||
|
|
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| Write a function that takes a string as input and returns the string reversed. | ||
| */ | ||
| // time: 2018年12月26日 | ||
|
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| package reversestring | ||
|
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| // double index | ||
| // time complexity: O(n) | ||
| // space complexity: O(1) | ||
| func reverseString(s string) string { | ||
| var ( | ||
| l int | ||
| r = len(s) - 1 | ||
| ) | ||
|
|
||
| for r >= l { | ||
| 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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| // double index | ||
| // time complexity: O(n) | ||
| // space complexity: O(n) | ||
| func reverseString1(s string) string { | ||
| sLen := len(s) | ||
| runes := []rune(s) | ||
| for i := 0; i < sLen/2; i++ { | ||
| runes[i], runes[sLen-i-1] = runes[sLen-i-1], runes[i] | ||
| } | ||
| return string(runes) | ||
| } |
45 changes: 45 additions & 0 deletions
src/0344_reverse_string/reverse_string_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| package reversestring | ||
|
|
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| import "testing" | ||
|
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| func TestReverseString(t *testing.T) { | ||
| testCases := []string{ | ||
| "hello", | ||
| "A man, a plan, a canal: Panama", | ||
| "", | ||
| "ab", | ||
| } | ||
| expected := []string{ | ||
| "olleh", | ||
| "amanaP :lanac a ,nalp a ,nam A", | ||
| "", | ||
| "ba", | ||
| } | ||
|
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| for index, data := range testCases { | ||
| if res := reverseString(data); res != expected[index] { | ||
| t.Errorf("expected %s, got %s", expected[index], res) | ||
| } | ||
| } | ||
| } | ||
|
|
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| func TestReverseString1(t *testing.T) { | ||
| testCases := []string{ | ||
| "hello", | ||
| "A man, a plan, a canal: Panama", | ||
| "", | ||
| "ab", | ||
| } | ||
| expected := []string{ | ||
| "olleh", | ||
| "amanaP :lanac a ,nalp a ,nam A", | ||
| "", | ||
| "ba", | ||
| } | ||
|
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| for index, data := range testCases { | ||
| if res := reverseString1(data); res != expected[index] { | ||
| t.Errorf("expected %s, got %s", expected[index], res) | ||
| } | ||
| } | ||
| } |
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