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.
401Please respect copyright.ＰＥＮＡＮＡixa0ycS2Nc
Two Pointers
class Solution {401Please respect copyright.ＰＥＮＡＮＡR6TOsohqVp
// Return true if the character is a vowel (case-insensitive)401Please respect copyright.ＰＥＮＡＮＡ3SlhdT0HYV
// booleann(for ture or false), 創造"isVowel"(class), 命名(char c), and add aeiouAEIOU401Please respect copyright.ＰＥＮＡＮＡAcb0H7FLtB
// 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。401Please respect copyright.ＰＥＮＡＮＡgHEw9vzjDB
boolean isVowel(char c) {401Please respect copyright.ＰＥＮＡＮＡkV4VYXSEbC
return c == 'a' || c == 'i' || c == 'e' || c == 'o' || c == 'u'401Please respect copyright.ＰＥＮＡＮＡoD5vJlQGrv
|| c == 'A' || c == 'I' || c == 'E' || c == 'O' || c == 'U';401Please respect copyright.ＰＥＮＡＮＡ06rE1LQmfM
}401Please respect copyright.ＰＥＮＡＮＡXdMf7tKZGm
401Please respect copyright.ＰＥＮＡＮＡWlt8vMPMYW
// Function to swap characters at index x and y401Please respect copyright.ＰＥＮＡＮＡ8jMCieF5Zb
void swap(char[] chars, int x, int y) {401Please respect copyright.ＰＥＮＡＮＡL2I9mVgzHd
char temp = chars[x];401Please respect copyright.ＰＥＮＡＮＡhO01H1NF5t
chars[x] = chars[y];401Please respect copyright.ＰＥＮＡＮＡi4H48RzRuI
chars[y] = temp;401Please respect copyright.ＰＥＮＡＮＡScp513idwG
}401Please respect copyright.ＰＥＮＡＮＡJR6mVbpLOq
401Please respect copyright.ＰＥＮＡＮＡokcZ65au54
public String reverseVowels(String s) {401Please respect copyright.ＰＥＮＡＮＡ7h4cJ9SKpx
// 設定最左的字母是[0]401Please respect copyright.ＰＥＮＡＮＡ1IaFxHDDbC
int start = 0;401Please respect copyright.ＰＥＮＡＮＡKAdjB8uKhR
// 設定最右的字母是[文字總長度-1].401Please respect copyright.ＰＥＮＡＮＡHaQ0mhjsX5
int end = s.length() - 1;401Please respect copyright.ＰＥＮＡＮＡM75f3Ub1z3
// 將 String 轉換為 char 數組，因為 String 在 Java 中是不可變的401Please respect copyright.ＰＥＮＡＮＡAOpsUYu3pn
char[] sChar = s.toCharArray();401Please respect copyright.ＰＥＮＡＮＡHWOlsG1vnF
401Please respect copyright.ＰＥＮＡＮＡaGMrBSewN6
// While we still have characters to traverse401Please respect copyright.ＰＥＮＡＮＡ1m4iy1IoGt
// while the word more than one letter, do this function401Please respect copyright.ＰＥＮＡＮＡRlXEKgYPZ8
while (start < end) {401Please respect copyright.ＰＥＮＡＮＡkyAPeTT7XJ
// Find the leftmost vowel401Please respect copyright.ＰＥＮＡＮＡJpUtajoHkP
// while start 少於 string length() 同時 [start] 不是vowel，return start ++401Please respect copyright.ＰＥＮＡＮＡB9KVFqgxsy
while (start < s.length () && !isVowel(sChar[start])) {401Please respect copyright.ＰＥＮＡＮＡ05ds32Mwut
start++;401Please respect copyright.ＰＥＮＡＮＡEbn8c6QHP2
}401Please respect copyright.ＰＥＮＡＮＡ8XNZxgnoXh
// Find the rightmost vowel401Please respect copyright.ＰＥＮＡＮＡ1OWvr6UdnB
// while end 大於 0 同時 [end] 不是vowel，return end --401Please respect copyright.ＰＥＮＡＮＡ6hXUKx5v0I
while (end >= 0 && !isVowel(sChar[end])) {401Please respect copyright.ＰＥＮＡＮＡO89cn0tkMZ
end--;401Please respect copyright.ＰＥＮＡＮＡeO1Xti68nN
}401Please respect copyright.ＰＥＮＡＮＡzhpfaBYZuI
// Swap them if start is left of end401Please respect copyright.ＰＥＮＡＮＡEVcJju35TM
// swap function: (in what string, value 1, value 2), swap value 1 and 2401Please respect copyright.ＰＥＮＡＮＡqy6BvsysEJ
if (start < end) {401Please respect copyright.ＰＥＮＡＮＡrutpCqY4tc
swap(sChar, start++, end--);401Please respect copyright.ＰＥＮＡＮＡC6UnAkyhiY
}401Please respect copyright.ＰＥＮＡＮＡjQaOH3MhhC
}401Please respect copyright.ＰＥＮＡＮＡxPD7jm59Nd
401Please respect copyright.ＰＥＮＡＮＡJPipxOcOJS
// Converting char array back to String401Please respect copyright.ＰＥＮＡＮＡJUlWTCXJWF
// 顯示新的String401Please respect copyright.ＰＥＮＡＮＡDpd5DZsa97
return new String(sChar);401Please respect copyright.ＰＥＮＡＮＡ78dUe6NCtc
}401Please respect copyright.ＰＥＮＡＮＡOsoDvsvPwG
};
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