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.
class Solution {
public:
char findTheDifference(string s, string t) {
vector<int> a(26);
vector<int> b(26);
for(auto x : s) {
a[x-'a']++;
}
for (auto x : t) {
b[x-'a']++;
}
char ans;
for (int i = 0; i < 26; ++i) {
if (a[i] != b[i]) {
ans = char(i + 'a');
}
}
return ans;
}
};