Given a string s, reverse only all the vowels in the string and return it.
The vowels are 'a', 'e', 'i', 'o', and 'u', and they can appear in both lower and upper cases, more than once.
342Please respect copyright.ＰＥＮＡＮＡyTX21doPJz
Two Pointers
class Solution {342Please respect copyright.ＰＥＮＡＮＡ8XMr1RtgFb
// Return true if the character is a vowel (case-insensitive)342Please respect copyright.ＰＥＮＡＮＡ9Zq1ZNP73s
// booleann(for ture or false), 創造"isVowel"(class), 命名(char c), and add aeiouAEIOU342Please respect copyright.ＰＥＮＡＮＡtAnIXbWI8v
// 當 (char c) 不是vowel，return false/ 是vowel，return true
// * a||b = ab 全为 false 时，计算结果为 false，否则为 true。342Please respect copyright.ＰＥＮＡＮＡ9cLksGGDq7
boolean isVowel(char c) {342Please respect copyright.ＰＥＮＡＮＡi1lHjUXCum
return c == 'a' || c == 'i' || c == 'e' || c == 'o' || c == 'u'342Please respect copyright.ＰＥＮＡＮＡUFrbMn44s4
|| c == 'A' || c == 'I' || c == 'E' || c == 'O' || c == 'U';342Please respect copyright.ＰＥＮＡＮＡKzBZ3Xd09M
}342Please respect copyright.ＰＥＮＡＮＡ5K8c754Pms
342Please respect copyright.ＰＥＮＡＮＡ7yWnWBC1Ad
// Function to swap characters at index x and y342Please respect copyright.ＰＥＮＡＮＡaMVK0VmdsN
void swap(char[] chars, int x, int y) {342Please respect copyright.ＰＥＮＡＮＡHzrYEPY6iu
char temp = chars[x];342Please respect copyright.ＰＥＮＡＮＡW2Q2oNaRML
chars[x] = chars[y];342Please respect copyright.ＰＥＮＡＮＡq6A9FPgHZy
chars[y] = temp;342Please respect copyright.ＰＥＮＡＮＡ75mwYq7SLA
}342Please respect copyright.ＰＥＮＡＮＡFOuU6Ee6GW
342Please respect copyright.ＰＥＮＡＮＡl5zoDppfZD
public String reverseVowels(String s) {342Please respect copyright.ＰＥＮＡＮＡxpS8Fy8AaD
// 設定最左的字母是[0]342Please respect copyright.ＰＥＮＡＮＡnBo4BwElM9
int start = 0;342Please respect copyright.ＰＥＮＡＮＡIh1UjX4K0w
// 設定最右的字母是[文字總長度-1].342Please respect copyright.ＰＥＮＡＮＡFTItTmlRAQ
int end = s.length() - 1;342Please respect copyright.ＰＥＮＡＮＡyMmGhWd23i
// 將 String 轉換為 char 數組，因為 String 在 Java 中是不可變的342Please respect copyright.ＰＥＮＡＮＡLphIBARKo0
char[] sChar = s.toCharArray();342Please respect copyright.ＰＥＮＡＮＡktge6Dvg2W
342Please respect copyright.ＰＥＮＡＮＡS1wStOyMaf
// While we still have characters to traverse342Please respect copyright.ＰＥＮＡＮＡwQYudChE9l
// while the word more than one letter, do this function342Please respect copyright.ＰＥＮＡＮＡAMzxGtmW9z
while (start < end) {342Please respect copyright.ＰＥＮＡＮＡfXpsUGalkV
// Find the leftmost vowel342Please respect copyright.ＰＥＮＡＮＡjtrXUVyoAO
// while start 少於 string length() 同時 [start] 不是vowel，return start ++342Please respect copyright.ＰＥＮＡＮＡdvgmZ5Ir5O
while (start < s.length () && !isVowel(sChar[start])) {342Please respect copyright.ＰＥＮＡＮＡsAcaW58YpL
start++;342Please respect copyright.ＰＥＮＡＮＡP5yKEf6KuV
}342Please respect copyright.ＰＥＮＡＮＡJ2uoU6IUAE
// Find the rightmost vowel342Please respect copyright.ＰＥＮＡＮＡvyVHFucNQM
// while end 大於 0 同時 [end] 不是vowel，return end --342Please respect copyright.ＰＥＮＡＮＡXwnYLP7Qus
while (end >= 0 && !isVowel(sChar[end])) {342Please respect copyright.ＰＥＮＡＮＡMYmpar4Ueh
end--;342Please respect copyright.ＰＥＮＡＮＡXhIOAV31IE
}342Please respect copyright.ＰＥＮＡＮＡAomMoBbmMm
// Swap them if start is left of end342Please respect copyright.ＰＥＮＡＮＡE09MXtBygv
// swap function: (in what string, value 1, value 2), swap value 1 and 2342Please respect copyright.ＰＥＮＡＮＡVp6a5IV8WO
if (start < end) {342Please respect copyright.ＰＥＮＡＮＡSfjiM7dqmt
swap(sChar, start++, end--);342Please respect copyright.ＰＥＮＡＮＡIbCNYCt7eM
}342Please respect copyright.ＰＥＮＡＮＡOoB89Gl6fZ
}342Please respect copyright.ＰＥＮＡＮＡH8MDaF9jVz
342Please respect copyright.ＰＥＮＡＮＡtUrw9Gkjtf
// Converting char array back to String342Please respect copyright.ＰＥＮＡＮＡaOThPR5Nse
// 顯示新的String342Please respect copyright.ＰＥＮＡＮＡQvziWNBTYQ
return new String(sChar);342Please respect copyright.ＰＥＮＡＮＡKoTAzGuYHR
}342Please respect copyright.ＰＥＮＡＮＡ0kXJcgsUhM
};
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