s*******n
发帖数: 66 | 1 one brainteaser question to play in matrix. His objective is to make it
non-singular and my objective is to make it singular. What is the strategy?
感觉和奇偶性有关,但不确定. 有比较好的方法吗?多谢! | t**o
发帖数: 64 | 2 Try to be the one to fill the last entry.
【在 s*******n 的大作中提到】
: one brainteaser question to play in matrix. His objective is to make it
: non-singular and my objective is to make it singular. What is the strategy?
: 感觉和奇偶性有关,但不确定. 有比较好的方法吗?多谢!
| s*******n
发帖数: 66 | 3 对,能详细解释一下吗?谢谢
【在 t**o 的大作中提到】
: Try to be the one to fill the last entry.
| f**x
发帖数: 4325 | 4 怎么个play法？动过的位置还能动第二次吗？
【在 s*******n 的大作中提到】
: one brainteaser question to play in matrix. His objective is to make it
: non-singular and my objective is to make it singular. What is the strategy?
: 感觉和奇偶性有关,但不确定. 有比较好的方法吗?多谢!
| o********6
发帖数: 3 | 5 if the matrix is 2n*2n, then it is possible to make it singular to take the
after-play. Which means when he wrote a number x at position (i,j), you then
wrote -x at position (i,n+1-j). Then after doing this, the matrix is
definitely singular. for the odd case, no ideas.
【在 s*******n 的大作中提到】
: one brainteaser question to play in matrix. His objective is to make it
: non-singular and my objective is to make it singular. What is the strategy?
: 感觉和奇偶性有关,但不确定. 有比较好的方法吗?多谢!
| k**x
发帖数: 2611 | 6 for n odd, you should fill first.
you can first fill the center one with 0.
Then it is easy to make two columns with opposite sign.
the
then
【在 o********6 的大作中提到】
: if the matrix is 2n*2n, then it is possible to make it singular to take the
: after-play. Which means when he wrote a number x at position (i,j), you then
: wrote -x at position (i,n+1-j). Then after doing this, the matrix is
: definitely singular. for the odd case, no ideas.
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