284.寻找文件副本

class Solution {
    public int findRepeatDocument(int[] documents) {
        Arrays.sort(documents);
        for(int i=1;i<documents.length;i++){
            if(documents[i]==documents[i-1]){
                return documents[i];
            }
        }
        return 0;
    }
}

class Solution(object):
    def findRepeatDocument(self, documents):
        documents.sort()
        for i in range(1,len(documents)):
            if documents[i]==documents[i-1]:
                return documents[i]
        return 0