29 人解决，56 人已尝试。
31 份提交通过，共有 122 份提交。
5.6 EMB 奖励。
单点时限: 2.0 sec
内存限制: 256 MB
Let f(n) be a sum of digits for positive integer n. If f(n) is one-digit number then it is a digital root for n and otherwise digital root of n is equal to digital root of f(n). For example, digital root of 987 is 6. Your task is to find digital root for expression A1A2…AN + A1A2…AN-1 + … + A1*A2 + A1.
Input file consists of few test cases. There is K (1<=K<=5) in the first line of input. Each test case is a line. Positive integer number N is written on the first place of test case (N<=1000). After it there are N positive integer numbers (sequence A). Each of this numbers is non-negative and not more than 10^9.
Write one line for every test case. On each line write digital root for given expression.
1 3 2 3 4
5
29 人解决，56 人已尝试。
31 份提交通过，共有 122 份提交。
5.6 EMB 奖励。
创建: 16 年，12 月前.
修改: 7 年，2 月前.
最后提交: 1 年，4 月前.
来源: N/A