
ZOJ Problem Set  2216
Kid is a famous thief and he is known for his unique habit. Before his attempt, he will always inform the person who he is going to rob beforehand. Though the people have paid much attention to him, he has never failed. This time Kid informed a billionaire, Jack, that he is going to enter Jack��s home to take away his expensive treasure. Jack is very afraid and he asked a brilliant boy, Conan, to help him. Conan designed a special lock for Jack��s home. However, Kid is very tricky and he stole the structure map and the password of the lock. From the structure map (see Figure1), Kid knows that the lock contains K dial plates and K gears, and every dial plate controls several gears. There are N teeth on each gear, which is numbered counterclockwise from 1 to N. When a certain dial plate is dialed, the gears that refer to the plate will rotate counterclockwise by several teeth (different gears may rotate different numbers of teeth). A dial plate can be dialed more than once. At the beginning, the numbers of the top teeth of the gears are all ��1��. To open the lock, the number of the top tooth of every gear must be a certain number. These K numbers form the password. Take Figure1 for an example where N = 8, K = 4; if the password is 1281, the lock will open. With the password in hand, Kid wants to know whether he can open the lock; and if he can, he wants to know the least number of dials he has to use to open the lock. You may assume that the lock is always locked at the beginning, which means that the password cannot be K ��1��s. Input There are several test cases. In the first line of each case there are two integers K (1 <= K <= 20) and N (2 <= N <= 10). Then follows a line with K integers expressing the password. Each number in the password is between 1 and N. Then come K lines, the ith of which describes how the ith dial plate controls the referred gears. These K lines have the following format: p a1 b1 a2 b2 ... ap bp Integer p (0 <= p <= K) expresses the number of gears that are referred to the dial plate. ai (1 <= i <= p) is an integer between 1 and K which tells that the aith gear is under the control of this dial plate. bi is an integer between 1 and N1 which tells that when the dial plate is dialed once, the aith gear will rotate across by bi gears. A test case of K = 0 and N = 0 indicates the end of input, and should not be processed. Output For each test case, there is a single line. If the lock can be opened, the line contains the least number of times Kid should dial the dial plates; otherwise, output ��No solution��. Sample Input
1 4 Sample Output
No solution Source: Asia 2004, Beijing (Mainland China) 