Compare Strings

Compare two strings A and B, determine whether A contains all of the characters in B.

The characters in string A and B are all Upper Case letters.

Have you met this question in a real interview? Yes
Example
For A = “ABCD”, B = “ACD”, return true.

For A = “ABCD”, B = “AABC”, return false.

Note
The characters of B in A are not necessary continuous or ordered.

public class Solution {    /**     * @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     */    public boolean compareStrings(String A, String B) {        if(A.length() < B.length()) return false;        Map<Character, Integer> map = new HashMap<Character, Integer>();        for(int i = 0; i < A.length(); i++) {            char c = A.charAt(i);            if(map.containsKey(c)) {                int value = map.get(c);                map.put(c, ++value);            }else {                map.put(c, 1);            }        }        for(int i = 0; i < B.length(); i++) {            char c = B.charAt(i);            if(map.containsKey(c)) {                int value = map.get(c);                if(--value < 0) return false;                map.put(c, value);            }else {                return false;            }        }        return true;    }}