Title
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.
题目大意:找多出来的那个字符是啥
Solution
自己做的，AC，这个还可以用SOR异或做的
//cpp:
class Solution {
public:
char findTheDifference(string s, string t) {
int nums[256] = { 0 };
for (int i = 0; i < s.length(); i++) {
nums[s[i]]++;
}
for (int i = 0; i < t.length(); i++) {
if (nums[t[i]] > 0) {
nums[t[i]]--;
}
else {
return t[i];
}
}
return -1;
}
};