[884]两句话中的不常见单词

package T884两句话中的不常见单词;

import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class Solution {

    public String[] uncommonFromSentences(String A, String B) {
        A = A + ' ' + B;
        String [] a = A.split(" ");

        HashMap<String, Integer> m = new HashMap<>();
        for (String anA : a) {
            m.put(anA, m.getOrDefault(anA, 0)+1);
        }
        List<String> b = new LinkedList<>();
        for (Map.Entry<String, Integer> x : m.entrySet()) {
            if (x.getValue() == 1) {
                b.add(x.getKey());
            }
        }
        return b.toArray(new String[0]);
    }

}

```
import collections

# 统计只出现一次的单词即可
class Solution:
    def uncommonFromSentences(self, A: str, B: str):
        A =A + ' '+ B

        a = collections.Counter(A.split(' '))

        for k in list(a.keys()):
            if a[k] >1:
                a.pop(k)
        a = list(a.keys())

        return a

if __name__ == '__main__':
    x = Solution()

    A="apple apple"
    B="banana"
    print(x.uncommonFromSentences(A,B))