How to assign values ​​to this array!

87403786

There is a two-dimensional array s, 1000 rows and 1000 columns, s [1000] [1000]
Requirement 1) Initialization with oxff
    2) The bit position corresponding to the strong number is 0
For example: the fourth bit of the fourth column s [3] [0] is 0
That is, 0 is assigned at the position where the oblique triangle is formed from the 0th bit. Other position is 1
It ’s like: 0111 1111 1111 1111 1111 1111 .. corresponds to s [0] [0] -s [0] [2] 7f ff ff
      1011 1111 1111 1111 1111 1111 ....... Bf ff ff .......
      1101 1111 1111 1111 1111 1111 ......... Df ff ff .......
         .......

Thank you all!