given a NxM integer matrix and i1,j1,i2,j2

such that i1 < i2 and j1 < j2

tell in O(1) that whether all elements in the rectangular submatrix formed by (i1 , j1) , (i1 , j2) , (i2 , j1) , (i2 , j2)

contains all same elements or not .

example —

input —

6

0 1 1 1 0 1

4 4 4 4 1 0

1 2 2 4 2 4

1 1 2 2 2 4

4 4 4 4 2 4

4 4 4 4 4 0

4 0 5 3 // zero based indexing , i1 , j1 , i2 , j2

output — yes