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.
338Please respect copyright.ＰＥＮＡＮＡOLZXPwD771
Two Pointers
class Solution {338Please respect copyright.ＰＥＮＡＮＡrog0TVNYnt
// Return true if the character is a vowel (case-insensitive)338Please respect copyright.ＰＥＮＡＮＡijjT3qwWmc
// booleann(for ture or false), 創造"isVowel"(class), 命名(char c), and add aeiouAEIOU338Please respect copyright.ＰＥＮＡＮＡDnTy6hERsc
// 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。338Please respect copyright.ＰＥＮＡＮＡ46g19ZMgc5
boolean isVowel(char c) {338Please respect copyright.ＰＥＮＡＮＡnvQRgdLcfl
return c == 'a' || c == 'i' || c == 'e' || c == 'o' || c == 'u'338Please respect copyright.ＰＥＮＡＮＡt87M437VxJ
|| c == 'A' || c == 'I' || c == 'E' || c == 'O' || c == 'U';338Please respect copyright.ＰＥＮＡＮＡAucoAGq3aM
}338Please respect copyright.ＰＥＮＡＮＡOm6ngoW05w
338Please respect copyright.ＰＥＮＡＮＡ6danSVQG7I
// Function to swap characters at index x and y338Please respect copyright.ＰＥＮＡＮＡBPXAEnQkQK
void swap(char[] chars, int x, int y) {338Please respect copyright.ＰＥＮＡＮＡgS7x351mhd
char temp = chars[x];338Please respect copyright.ＰＥＮＡＮＡdyz6W5CLIm
chars[x] = chars[y];338Please respect copyright.ＰＥＮＡＮＡHRKuchJP6i
chars[y] = temp;338Please respect copyright.ＰＥＮＡＮＡAr1zaoQmF4
}338Please respect copyright.ＰＥＮＡＮＡEYWDUJ69t6
338Please respect copyright.ＰＥＮＡＮＡtnUIoyiDeu
public String reverseVowels(String s) {338Please respect copyright.ＰＥＮＡＮＡUNELdomryf
// 設定最左的字母是[0]338Please respect copyright.ＰＥＮＡＮＡu8LKz16cpn
int start = 0;338Please respect copyright.ＰＥＮＡＮＡ7HEmvcaysR
// 設定最右的字母是[文字總長度-1].338Please respect copyright.ＰＥＮＡＮＡP4RUXjnTS4
int end = s.length() - 1;338Please respect copyright.ＰＥＮＡＮＡM8hKbegPRs
// 將 String 轉換為 char 數組，因為 String 在 Java 中是不可變的338Please respect copyright.ＰＥＮＡＮＡsmMeIGIxr8
char[] sChar = s.toCharArray();338Please respect copyright.ＰＥＮＡＮＡnIVmEeKtmj
338Please respect copyright.ＰＥＮＡＮＡrSxC4VzKB2
// While we still have characters to traverse338Please respect copyright.ＰＥＮＡＮＡGULPfUcLGR
// while the word more than one letter, do this function338Please respect copyright.ＰＥＮＡＮＡZdFUGzwIU4
while (start < end) {338Please respect copyright.ＰＥＮＡＮＡHHCqJDXnmq
// Find the leftmost vowel338Please respect copyright.ＰＥＮＡＮＡpIVZc1OzNM
// while start 少於 string length() 同時 [start] 不是vowel，return start ++338Please respect copyright.ＰＥＮＡＮＡx7ZTa1TiQ0
while (start < s.length () && !isVowel(sChar[start])) {338Please respect copyright.ＰＥＮＡＮＡkZV2yPDdWp
start++;338Please respect copyright.ＰＥＮＡＮＡMB3hwVhNTD
}338Please respect copyright.ＰＥＮＡＮＡgkLQzprEou
// Find the rightmost vowel338Please respect copyright.ＰＥＮＡＮＡj0ji6XRmwt
// while end 大於 0 同時 [end] 不是vowel，return end --338Please respect copyright.ＰＥＮＡＮＡSrJ1A2GF3I
while (end >= 0 && !isVowel(sChar[end])) {338Please respect copyright.ＰＥＮＡＮＡCp7FRvEJAM
end--;338Please respect copyright.ＰＥＮＡＮＡcfmwhB9W3j
}338Please respect copyright.ＰＥＮＡＮＡPEXyIrGrCE
// Swap them if start is left of end338Please respect copyright.ＰＥＮＡＮＡrUv4YPYIJl
// swap function: (in what string, value 1, value 2), swap value 1 and 2338Please respect copyright.ＰＥＮＡＮＡlnCUbOhYOL
if (start < end) {338Please respect copyright.ＰＥＮＡＮＡ07dJba40s0
swap(sChar, start++, end--);338Please respect copyright.ＰＥＮＡＮＡYAYiWSLEoG
}338Please respect copyright.ＰＥＮＡＮＡjmJvgAsmtA
}338Please respect copyright.ＰＥＮＡＮＡLZ3OsJrRrD
338Please respect copyright.ＰＥＮＡＮＡRF3IXM47sT
// Converting char array back to String338Please respect copyright.ＰＥＮＡＮＡaMzRon7zpP
// 顯示新的String338Please respect copyright.ＰＥＮＡＮＡVODwt2FspA
return new String(sChar);338Please respect copyright.ＰＥＮＡＮＡGcH2Igz0cg
}338Please respect copyright.ＰＥＮＡＮＡBO4dpNKyBO
};
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