def main(): # 读取输入 n = int(input()) # 创建二维数组并读取数据 matrix = [] for i in range(n): row = list(map(int, input().split())) matrix.append(row) # 将二维数组转换为一维数组 result = [] for i in range(n): for j in range(n): result.append(matrix[i][j]) # 输出结果 print(' '.join(map(str, result))) if __name__ == "__main__": main()