比较两个字符串A和B,确定A中是否包含B中所有的字符。字符串A和B中的字符都是大写字母。
样例
给出 A = “ABCD” B = “ACD”,返回 true;
给出 A = “ABCD” B = “AABC”, 返回 false。
注意
在 A 中出现的 B 字符串里的字符不需要连续或者有序。
English Version:
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.
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;
}
}