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)