9: 011113358: 0455556777888899997: 0*7*6: 334*455: 5*4: 13: 2: 2*
All students did good job for this problem. 1~2 points were deducted for a wrong answer.
Most students received full credit for this problem.
5 points for each of the two subproblems
One problem is that some students didn’t mention what is the trend of the function for different cases.
Most students received 7~9 points since they didn’t provide comprehensive descriptions for their answers.
Most students did good job. Some others provided wrong answers.
-3 for people who didn’t notice the constraint that any two letters should not be set to a same digit.
Most students provided complete algorithms and codes for this problem, although there were some errors.
Some students didn’t provide answer to this problem, and some others only provided partial solution. For students who did not explain their answer code, 3~7 points were deducted.
Created by: En Cheng. Date: 2007-02-17. Last Modified: 2008-02-19
by Zheng Liu.