16 Sep Aurora Saturday 14:30 Python Practice 21.09.11.
Question:
You have n boxes in a line on the table numbered 1 . . . n from left to right. Your task is to simulate 4 kinds of commands:

 1 X Y : move box X to the left to Y (ignore this if X is already the left of Y )
 2 X Y : move box X to the right to Y (ignore this if X is already the right of Y )
 3 X Y : swap box X and Y
 4: reverse the whole line.
Commands are guaranteed to be valid, i.e. X will be not equal to Y .
For example, if n = 6, after executing 1 1 4, the line becomes 2 3 1 4 5 6. Then after executing 2 3 5, the line becomes 2 1 4 5 3 6. Then after executing 3 1 6, the line becomes 2 6 4 5 3 1. Then after executing 4, then line becomes 1 3 5 4 6 2
Input Specification:
There will be at most 10 test cases. Each test case begins with a line containing 2 integers n, m (1 ≤ n, m ≤ 100, 000). Each of the following m lines contain a command.
Output Specification:
For each test case, print the sum of numbers at oddindexed positions. Positions are numbered 1 to n from left to right.
Sample Input 6 4 1 1 4 2 3 5 3 1 6 4 6 3 1 1 4 2 3 5 3 1 6 100000 1 4 Sample Output Case 1: 12 Case 2: 9 Case 3: 2500050000
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