Kth Subtree
题目描述
Click here to read PDF of this problem
输入格式
As shown in the PDF.
输出格式
As shown in the PDF
样例
2 1
1 2
1
2 3
1 2
2
提示
by 20张席畅
As shown in the PDF.
As shown in the PDF
2 1
1 2
1
2 3
1 2
2
by 20张席畅