赎金信——Leetcode

 代码实现:

public class CanConstruct {

    public static void main(String[] args) {
        CanConstruct canConstruct = new CanConstruct();
        System.out.println(canConstruct.canConstruct("aa","ab"));

    }

    public boolean canConstruct(String ransomNote, String magazine) {
        int[] arr = new int[26];
        for (int i = 0; i < magazine.length(); i++){
            char temp = magazine.charAt(i);
            arr[temp - 'a'] ++;
        }
        for (int i = 0; i < ransomNote.length(); i++){
            char temp = ransomNote.charAt(i);
            if (arr[temp - 'a'] <= 0){
                return false;
            }
            arr[temp - 'a']--;
        }
        return true;
    }
}