LintCode: Compare Strings

C++

class Solution {
public:
    /**
     * @param A: A string includes Upper Case letters
     * @param B: A string includes Upper Case letter
     * @return:  if string A contains all of the characters in B return true 
     *           else return false
     */
    bool compareStrings(string A, string B) {
        // write your code here
        if (B == "") {
            return true;
        }
        for (int i=0; i<B.size(); i++) {
            int j = A.find_first_of(B[i]);
            if (j == -1){
                return false;;
            } else {
                A[j] = '-';
            }
        }
        return true;
    }
};