When Can We Meet?
Time Limit:1000MS Memory Limit:30000K
Total Submit:568 Accepted:368
Description
The ICPC committee would like to have its meeting as soon as possible to address every little issue of the next contest. However, members of the committee are so busy maniacally developing (possibly useless) programs that it is very difficult to arrange their schedules for the meeting. So, in order to settle the meeting date, the chairperson requested every member to send back a list of convenient dates by E-mail. Your mission is to help the chairperson, who is now dedicated to other issues of the contest, by writing a program that chooses the best date from the submitted lists. Your program should find the date convenient for the most members. If there is more than one such day, the earliest is the best.
Input
The input has multiple data sets, each starting with a line containing the number of committee members and the quorum of the meeting.
N Q
Here, N, meaning the size of the committee, and Q meaning the quorum, are positive integers. N is less than 50, and, of course, Q is less than or equal to N.
N lines follow, each describing convenient dates for a committee member in the following format.
M Date1 Date2 ... DateM
Here, M means the number of convenient dates for the member, which is an integer greater than or equal to zero. The remaining items in the line are his/her dates of convenience, which are positive integers less than 100, that is, 1 means tomorrow, 2 means the day after tomorrow, and so on. They are in ascending order without any repetition and separated by a space character. Lines have neither leading nor trailing spaces.
A line containing two zeros indicates the end of the input.
Output
For each data set, print a single line containing the date number convenient for the largest number of committee members. If there is more than one such date, print the earliest. However, if no dates are convenient for more than or equal to the quorum number of members, print 0 instead.
Sample Input
3 2
2 1 4
0
3 3 4 8
3 2
4 1 5 8 9
3 2 5 9
5 2 4 5 7 9
3 3
2 1 4
3 2 5 9
2 2 4
3 3
2 1 2
3 1 2 9
2 2 4
0 0
Sample Output
4
5
0
2//其实就就是在给定的几个数组中找到最小的切重复次数大于或等于要求次数的数字
Tri Tiling
Time Limit:1000MS Memory Limit:65536K
Total Submit:1919 Accepted:905
Description
In how many ways can you tile a 3xn rectangle with 2x1 dominoes?
Here is a sample tiling of a 3x12 rectangle.
Input
Input consists of several test cases followed by a line containing -1. Each test case is a line containing an integer 0 <= n <= 30.
Output
For each test case, output one integer number giving the number of possible tilings.
Sample Input2
8
12
-1
Sample Output3
153
2131
//第二个可能比较难一点.
希望大家积极参与..注意程序的输出格式尽量和sample output一样.以便我为大家提交.不要输出任何提示输入的信息
