text: Sum of all Subarrays | Set 1 | function compute sum all sub - array ; computing sum of subarray using formula ; return all subarray sum ; driver program
code: def SubArraySum ( arr , n ) : NEW_LINE INDENT result = 0 NEW_LINE for i in range ( 0 , n ) : NEW_LINE INDENT result += ( arr [ i ] * ( i + 1 ) * ( n - i ) ) NEW_LINE DEDENT return result NEW_LINE DEDENT arr = [ 1 , 2 , 3 ] NEW_LINE n = len ( arr ) NEW_LINE print ( " Sum ▁ of ▁ SubArray ▁ : ▁ " , SubArraySum ( arr , n ) ) NEW_LINE