Function to find maximum equilibrium sum .
def findMaxSum ( arr , n ) : NEW_LINE INDENT ss = sum ( arr ) NEW_LINE prefix_sum = 0 NEW_LINE res = - sys . maxsize NEW_LINE for i in range ( n ) : NEW_LINE INDENT prefix_sum += arr [ i ] NEW_LINE if prefix_sum == ss : NEW_LINE INDENT res = max ( res , prefix_sum ) ; NEW_LINE DEDENT ss -= arr [ i ] ; NEW_LINE DEDENT return res NEW_LINE DEDENT