Let A be a square matrices of order m = min no of zero if A is a triangular matrices p = min no of zero if A is a diagonal matrices l = max no of different entries if A is a upper triangular matrix

your question is not very clear so i'm taking some assumption

m = order of matrix

n =min no of zero if A is a triangular matrices = m(m-1)/2
p =min no of zero if A is a diagonal matrices= m(m-1)
l = max no of different entries if A is a upper triangular matrix = m(m+1)/2

I hope you got your answer

Thanks & Regards
Sudhir,
askIITians Faculty
Qualification.
IIT Delhi