$/**$

$*$ Check whether there's no conflict in the board $($in each row, column and square$)$

$*$

$*$ Note: Don't duplicate code. Be sure to use checkConflictForArray method.

$*$ For each row, column and square, first create array of $9$ number set.

$*$ Then call checkConflictForArray method.

$*$

$*$ Checking square is a little tricky, below is a possible algorithm:

$*$ for $($each square s from all the $9$ squares in the board$)\{$

$*$ create a tempArr of size $9$

$*$ for $($each position $[$r$,$ c$]$ from all the $9$ positions in square s$)\{$

$*$ copy s$[$r$][$c$]$ into a corresponding position in tempArr

$*//$ you need to figure out a $1-$to$-1$ map between the index in tempArr

$*//$ and the index in square s

$*\}$

$*$ call checkConflictForArray with tempArr

$*\}$

$*$

$*$ @param board The current board that needs to be checked

$*$ @return true if no conflict; false otherwise, and when board is null

$*/$

public static boolean checkConflictForBoard$($int$[][]$ board$)\{$

return false;

$\}$