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557. Reverse Words in a String III #63

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zwfang merged 1 commit into master from 557-Reverse-Words-in-a-String-III
Jan 8, 2019
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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -54,6 +54,7 @@ continually updating 😃.
* [344. Reverse String](./src/0344_reverse_string/reverse_string.go)   *`string;`*  *`double index`*
* [345. Reverse Vowels of a String](./src/0345_reverse_vowels_of_a_string/reverse_vowels.go)   *`string;`*  *`double index`*
* [438. Find All Anagrams in a String](./src/0438_all_anagrams_in_a_string/all_anagrams_in_a_string.go)   *`sliding window`*
* [557. Reverse Words in a String III](src/0557_reverse_words_in_a_string_3/reverse_words_in_a_string_3.go)

### Linked List
* [2. Add Two Numbers](./src/0002_add_two_numbers/add_two_numbers.go)   *`recursion;`*  *`math`*
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/*
557. Reverse Words in a String III
https://leetcode.com/problems/reverse-words-in-a-string-iii/

Given a string, you need to reverse the order of characters in each word within a sentence
while still preserving whitespace and initial word order.

Note: In the string, each word is separated by single space and there will not be any extra space in the string.
*/
// time: 2019年01月08日

package rwias3

import "strings"

// split and reverse
// time complexity: O(len(s))
// space complexity: O(n)
func reverseWords(s string) string {
words := strings.Split(s, " ")

var temp []string
for _, word := range words {
temp = append(temp, reverseString(word))
}
return strings.Join(temp, " ")
}

func reverseString(s string) string {
runes := []rune(s)

for start, end := 0, len(runes)-1; start < end; start, end = start+1, end-1 {
runes[start], runes[end] = runes[end], runes[start]
}
return string(runes)
}
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package rwias3

import "testing"

func TestReverseWords(t *testing.T) {
s := "Let's take LeetCode contest"
expected := "s'teL ekat edoCteeL tsetnoc"

if res := reverseWords(s); res != expected {
t.Errorf("expected %s, got %s", expected, res)
}
}
1 change: 1 addition & 0 deletions src/README.md
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Expand Up @@ -93,6 +93,7 @@
|0447|[Number of Boomerangs](./0447_number_of_boomerangs/number_of_boomerangs.go)|Easy||
|0454|[4Sum II](./0454_4sum2/4sum2.go)|Medium||
|0455|[Assign Cookies](./0455_assign_cookies/assign_cookies.go)|Easy|*`greedy algorithm`*|
|0557|[557. Reverse Words in a String III](0557_reverse_words_in_a_string_3/reverse_words_in_a_string_3.go)|Easy|*`string`*|
|0674|[674. Longest Continuous Increasing Subsequence](0674_longest_continuous_increasing_subsequence/lcis.go)|Easy||
|0704|[Binary Search](0704_binary_search/binary_search.go)|Easy|*`binary search`*|
|0713|[713. Subarray Product Less Than K](0713_subarray_product_less_than_k/spltk.go)|Medium|*`sliding window`*|
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