L. Lena Sort - 2018.9 ECNU ICPC/CCPC Trial Round #1 - ECNU Online Judge

你可以在这里下载。

单点时限: 2.0 sec

内存限制: 512 MB

样例

Input

2
5 6
5 100

Output

4 2 1 3 5
-1

Input

Output

1
4 3 2 1
2 1 3

NaN

A. Average B. Boxed Lunch C. Cut Tree D. DP Killer E. Endless BFS F. Find Palindromic Subsets G. Gnomes H. Here Comes A Math Problem I. Intersections J. Jim and the Skyscrapers K. KBlack Playing Cards L. Lena Sort M. Memory Penalty