时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
Special Judge, 64bit IO Format: %lld
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
Special Judge, 64bit IO Format: %lld
题目描述
Given 
, construct a matrix 
of size 
, whose entries are all either 0 or 1, and no three distinct entries 
satisfying that 
. If multiple solutions exist, print any one of them. If no solution, print "-1" in one line.
输入描述:
Input only one line containing two integers.
输出描述:
If solutions exist, printlines each containing a
-string of length
, denoting the matrix you construct. If no solution, print "-1" in one line.