zoukankan      html  css  js  c++  java
  • 【C ECJTU_ACM 11级队员2012年暑假训练赛(2)】

    C - C
    Time Limit:10000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u

    Description

    Consider a group of N students and P courses. Each student visits zero, one or more than one courses. Your task is to determine whether it is possible to form a committee of exactly P students that satisfies simultaneously the conditions:

    . every student in the committee represents a different course (a student can represent a course if he/she visits that course)

    . each course has a representative in the committee

    Your program should read sets of data from a text file. The first line of the input file contains the number of the data sets. Each data set is presented in the following format:

    P N
    Count1 Student1 1 Student1 2 ... Student1 Count1
    Count2 Student2 1 Student2 2 ... Student2 Count2
    ...... 
    CountP StudentP 1 StudentP 2 ... StudentP CountP

    The first line in each data set contains two positive integers separated by one blank: P (1 <= P <= 100) - the number of courses and N (1 <= N <= 300) - the number of students. The next P lines describe in sequence of the courses . from course 1 to course P, each line describing a course. The description of course i is a line that starts with an integer Count i (0 <= Count i <= N) representing the number of students visiting course i. Next, after a blank, you'll find the Count i students, visiting the course, each two consecutive separated by one blank. Students are numbered with the positive integers from 1 to N.

    There are no blank lines between consecutive sets of data. Input data are correct.

    The result of the program is on the standard output. For each input data set the program prints on a single line "YES" if it is possible to form a committee and "NO" otherwise. There should not be any leading blanks at the start of the line.

    An example of program input and output:
     

    Input

    2 3 3 3 1 2 3 2 1 2 1 1 3 3 2 1 3 2 1 3 1 1
     

    Output

    YES NO
     

    Sample Input

    2 3 3 3 1 2 3 2 1 2 1 1 3 3 2 1 3 2 1 3 1 1
     

    Sample Output

    YES
    NO
     
     
  • 相关阅读:
    Java中的匿名对象、内部类、包、代码块
    Java中的final和static关键字
    Java中的this与super关键字
    Java中的构造方法
    Java中的多态
    Vue+Element中Table懒加载,新增、删除操作后手动更新
    JQ取消hover事件
    github.com访问慢解决
    vue cli3 子目录问题
    右键事件 contextmenu
  • 原文地址:https://www.cnblogs.com/ismdeep/p/2584776.html
Copyright © 2011-2022 走看看