Problem:
Score : 700 points

Problem Statement

Determine if there exists a sequence obtained by permuting 1,2,...,N that satisfies the following conditions:

The length of its longest increasing subsequence is A.

The length of its longest decreasing subsequence is B.

If it exists, construct one such sequence.

Notes

A subsequence of a sequence P is a sequence that can be obtained by extracting some of the elements in P without changing the order.

A longest increasing subsequence of a sequence P is a sequence with the maximum length among the subsequences of P that are monotonically increasing.

Similarly, a longest decreasing subsequence of a sequence P is a sequence with the maximum length among the subsequences of P that are monotonically decreasing.

Constraints

1 \leq N,A,B \leq 3\times 10^5

All input values are integers.

Input

Input is given from Standard Input in the following format:

N A B

Output

If there are no sequences that satisfy the conditions, print -1.

Otherwise, print N integers. The i-th integer should be the i-th element of the sequence that you constructed.

Sample Input 1

5 3 2

Sample Output 1

2 4 1 5 3

One longest increasing subsequence of this sequence is {2,4,5}, and one longest decreasing subsequence of it is {4,3}.

Sample Input 2

7 7 1

Sample Output 2

1 2 3 4 5 6 7

Sample Input 3

300000 300000 300000

Sample Output 3

-1

Solution in Ruby (2.3.3) (judge verdict: Wrong Answer)

N, A, B = gets.split.map(&:to_i)

if N == 1
    if A == 1 && B == 1
        print 1
    else
        print -1
    end

elsif N == 2
    if A == 2 && B == 1
        print '1 2'
    elsif A == 1 && B == 2
        print '2 1'
    else
        print -1
    end

elsif A + B > N + 1
    print -1

elsif A + B == N + 1
    result = (1..(A-1)).to_a
    result += [N]
    result += (A..(N-1)).to_a.reverse
    print result.join(' ')

elsif A * B >= N
    stairs = Array.new(A){Array.new()}
    N.downto(1) do |i|
        stairs[(N - i) % A].unshift(i)
    end
    result = []
    stairs.each do |stair|
        result += stair
    end
    print result.join(' ')
else
    print -1 
end