Saturday, April 23, 2016

LeetCode 345 - Reverse Vowels of a String

http://blog.csdn.net/ebowtang/article/details/51228095
Write a function that takes a string as input and reverse only the vowels of a string.
Example 1:
Given s = "hello", return "holle".
Example 2:
Given s = "leetcode", return "leotcede".
In the inner while loop, don't forget the condition "start less than end" while incrementing start and decrementing end. This is my friend's google phone interview question. Cheers! // update! May use a HashSet to reduce the look up time to O(1)
``````public String reverseVowels(String s) {
if(s == null || s.length()==0) return s;
String vowels = "aeiouAEIOU";
char[] chars = s.toCharArray();
int start = 0;
int end = s.length()-1;
while(start<end){

while(start<end && !vowels.contains(chars[start]+"")){
start++;
}

while(start<end && !vowels.contains(chars[end]+"")){
end--;
}

char temp = chars[start];
chars[start] = chars[end];
chars[end] = temp;

start++;
end--;
}
return new String(chars);
}
```

```
http://www.programcreek.com/2015/04/leetcode-reverse-vowels-of-a-string-java/
Use hashset
 ```public String reverseVowels(String s) { ArrayList vowList = new ArrayList(); vowList.add('a'); vowList.add('e'); vowList.add('i'); vowList.add('o'); vowList.add('u'); vowList.add('A'); vowList.add('E'); vowList.add('I'); vowList.add('O'); vowList.add('U');   char[] arr = s.toCharArray();   int i=0; int j=s.length()-1;   while(i
https://leetcode.com/discuss/99000/4ms-java-assume-ascii-input
private final char[] vowels = new char[]{'a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'}; public String reverseVowels(String s) { boolean[] map = new boolean[256]; for (char c : vowels) map[c] = true; int i = 0; int j = s.length() - 1; char[] word = s.toCharArray(); while (i < j) { while (i < j && !map[word[i]]) i++; while (i < j && !map[word[j]]) j--; char temp = word[i]; word[i] = word[j]; word[j] = temp; i++; j--; } return new String(word); }

```    void swapchar(string &str,int pos1,int pos2)
{
char tmpch=str[pos2];
str[pos2]=str[pos1];
str[pos1]=tmpch;
}
string reverseVowels(string s) {
char base[10]={'a','e','i','o','u','A','E','I','O','U'};
set<char> seting(base,base+10);
int startpos=0,endpos=s.size()-1;
while(startpos < endpos )
{
while( startpos < endpos && seting.find(s[startpos]) == seting.end())
startpos++;
while( startpos < endpos && seting.find(s[endpos]) == seting.end())
endpos--;
if(startpos < endpos)
swapchar(s,startpos++,endpos--);
}
return s;
}```

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