27 人解决，44 人已尝试。
37 份提交通过，共有 113 份提交。
5.1 EMB 奖励。
单点时限: 2.0 sec
内存限制: 256 MB
Let us denote the sum of digits of the number N by S(N). In this problem, we want you to determine, how often the following equality holds:
S(A+B) = S(A) + S(B)
There are several test cases.Each input contains a single positive integer K, 2 ≤ K ≤ 50.
You should output the number of pairs of K-digit numbers A and B to satisfy the above equality. Counting that number you should be aware of the following:
Numbers A and B should not have leading zeroes
While counting the total number of pairs, the order of numbers A and B matters, thus, for instance, (12, 26) and (26, 12) are different pairs that satisfy the conditions of the problem.
2
1980
27 人解决，44 人已尝试。
37 份提交通过，共有 113 份提交。
5.1 EMB 奖励。