Consider all possible pairs mat [ a ] [ b ] and mat [ d ] [ e ]
for a in range ( N - 1 ) : NEW_LINE INDENT for b in range ( N - 1 ) : NEW_LINE INDENT for d in range ( a + 1 , N ) : NEW_LINE INDENT for e in range ( b + 1 , N ) : NEW_LINE INDENT if maxValue < int ( mat [ d ] [ e ] - mat [ a ] [ b ] ) : NEW_LINE INDENT maxValue = int ( mat [ d ] [ e ] - mat [ a ] [ b ] ) ; NEW_LINE DEDENT DEDENT DEDENT DEDENT DEDENT return maxValue ; NEW_LINE