贴下 Python 写的，成功通过

#coding = utf-8
import sys

def solution(arr):
    l = []
    result = ''
    for a in arr:
        if a in l:
            l.remove(a)
        l.append(a)
    for a in l:
        result += str(a) + ' '
    return result[:-1]


if __name__ == "__main__":
    n = int(sys.stdin.readline().strip())
    arr = map(int, sys.stdin.readline().strip().split())
    print solution(arr)