Tách cây
View as PDF
Points:
1700 (p)
Time limit:
3.0s
Memory limit:
512M
Input:
stdin
Output:
stdout
Example
Sample input
10
? 1
A 1
A 1
A 2
A 4
A 2
? 4
C 2
? 1
? 4
Sample output
1
2
2
2
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