The 7th(2012) ACM Programming Contest of HUST - Preliminary Contest

From: 2012-11-17 12:00:00 To: 2012-11-17 17:00:00 Now: 2017-09-22 06:47:30 Status: Public

D - Substring

Time Limit: 2s Memory Limit: 64MB

Submissions: 771 Solved: 174
This problem is quiet easy.
Initially, there is a string A.
Then we do the following process infinity times.
 A := A + “HUSTACM” + A
For example, if a = “X”, then
After 1 step, A will become “XHUSTACMX”
After 2 steps, A will become “XHUSTACMXHUSTACMXHUSTACMX”
Let A = “X”, Now I want to know the characters from L to R of the final string.
Multiple test cases, in each test case, there are only one line containing two numbers L and R.
1 <= L <= R <= 10^12
R-L <= 100
For each test case, you should output exactly one line which containing the substring.
Sample Input
5 10
Sample Output

Problem Setter : Yang Xiao