张老师的生日问题

        private static void Demo()

        {

            List<int[]> list = new List<int[]>();

            list.Add(new int[] { 3, 4 });

            list.Add(new int[] { 3, 5 });

            list.Add(new int[] { 3, 8 });

            list.Add(new int[] { 6, 4 });

            list.Add(new int[] { 6, 7 });

            list.Add(new int[] { 9, 1 });

            list.Add(new int[] { 9, 5 });

            list.Add(new int[] { 12, 1 });

            list.Add(new int[] { 12, 2 });

            list.Add(new int[] { 12, 8 });

 

            int count = 0;

            List<int> list1 = new List<int>();//得到通过日期只出现一次的月份，即6，12月

 

            foreach (int[] date1 in list)

            {

                foreach (int[] date2 in list)

                {

                    if (date1[1] == date2[1])

                    {

                        count++;

                    }

                }

                if (count == 1)

                {

                    list1.Add(date1[0]);

                }

                count = 0;

            }

 

            List<int[]> list2 = new List<int[]>();//得到6月，12月的所有日期

            foreach (int i in list1)

            {

                foreach (int[] j in list)

                {

                    if (i == j[0])

                    {

                        list2.Add(j);

                    }

                }

            }

            //除掉月份为6，12的日期

            foreach (int[] i in list2)

            {

                list.Remove(i);//得到（3，4）（3，5）（3，8），（9，1）（9，5）

            }

 

            //==============================================

            List<int[]> list3 = new List<int[]>();//得到日期出现两次的

            foreach (int[] date1 in list)

            {

                foreach (int[] data2 in list)

                {

                    if (date1[1] == data2[1])

                    {

                        count++;

                    }

                }

                if (count > 1)

                {

                    list3.Add(date1);

                }

                count = 0;

            }

 

            foreach (int[] i in list3)

            {

                list.Remove(i); //得到（3，4）（3，8）（9，1）

            }

 

            //=============================================

            List<int[]> list4 = new List<int[]>();//月份重复数大于1个的

            foreach (int[] date1 in list)

            {

                foreach (int[] date2 in list)

                {

                    if (date1[0] == date2[0])

                    {

                        count++;

                    }

                }

                if (count > 1)

                {

                    list4.Add(date1);

                }

                count = 0;

            }

 

            foreach (int[] i in list4)

            {

                list.Remove(i); //（9，1）

            }

 

            foreach (int[] j in list)

            {

                Console.WriteLine("张老师的生日为：" + j[0] + "月" + j[1] + "日");

            }

            Console.ReadLine();

        }