Description
Given two strings s and t which consist of only lowercase letters.
String t is generated by random shuffling string s and then add one more letter at a random position.
Find the letter that was added in t.
Example:
Input:
s = "abcd"
t = "abcde"Output:
e
Explanation:
'e' is the letter that was added.
Solution
如果把char换成int，是不是立刻想到用异或去做？其实char就是int啊。
Bit operation
class Solution {
public char findTheDifference(String s, String t) {
char diff = t.charAt(t.length() - 1);
for (int i = 0; i < t.length() - 1; ++i) {
diff ^= s.charAt(i);
diff ^= t.charAt(i);
}
return diff;
}
}
