比较字符串

代码：
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.size()>A.size())  
       return false;  
      
    /*map<char,int> map_A,map_B; 
     
    for(int i=0;i<A.size();i++){ 
        map_A[A[i]]++; 
    } 
    for(int i=0;i<B.size();i++){ 
        map_B[B[i]]++; 
    } 
     
    map<char,int>::iterator it=map_B.begin(); 
    while(it!=map_B.end()){ 
        int cnt=map_A.count(it->first); 
        if(cnt<it->second) 
          return false; 
    } 
     
    return true; 
    */