HDU1144(模拟+hash)

Prerequisites?

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 732    Accepted Submission(s): 454

Problem Description

Freddie the frosh has chosen to take k courses. To meet the degree requirements, he must take courses from each of several categories. Can you assure Freddie that he will graduate, based on his course selection?

 

 

Input

Input consists of several test cases. For each case, the first line of input contains 1 ≤ k ≤ 100, the number of courses Freddie has chosen, and 0 ≤ m ≤ 100, the number of categories. One or more lines follow containing k 4-digit integers follow; each is the number of a course selected by Freddie. Each category is represented by a line containing 1 ≤ c ≤ 100, the number of courses in the category, 0 ≤ r ≤ c, the minimum number of courses from the category that must be taken, and the c course numbers in the category. Each course number is a 4-digit integer. The same course may fulfil several category requirements. Freddie's selections, and the course numbers in any particular category, are distinct. A line containing 0 follows the last test case.

 

 

Output

For each test case, output a line containing "yes" if Freddie's course selection meets the degree requirements; otherwise output "no."

 

 

Sample Input

3 2
0123 9876 2222
2 1 8888 2222
3 2 9876 2222 7654 
3 2
0123 9876 2222
2 2 8888 2222
3 2 7654 9876 2222
0

 

 

Sample Output

yes
no

 

 

 

简单模拟即可，注意用哈希表减少循环

#include<iostream>
using namespace std;
#define MAX 100+10
int  chosen[100000];
struct
{
 int num_course;
 int min_num;
 int course[MAX];
}category[MAX];

int main()
{
 int n,m,index;
 int i,j,k;
 int temp;

 while(cin>>n&&n)
 {
  memset(chosen,0,sizeof(chosen));
  cin>>m;
  for(i=1;i<=n;i++)
  {
   cin>>index;
   chosen[index]=1;
  }

  for(i=1;i<=m;i++)
  {
   cin>>category[i].num_course>>category[i].min_num;
   for(j=1;j<=category[i].num_course;j++)
    cin>>category[i].course[j];
  }

  for(i=1;i<=m;i++)
  {
   temp=0;
   for(j=1;j<=category[i].num_course;j++)
   {
    if(chosen[category[i].course[j]]==1)
     temp++;

   }
   if(temp<category[i].min_num)
    break;
  }

  if(i>m)
   cout<<"yes"<<endl;
  else 
   cout<<"no"<<endl;
 }
 return 0;
}