(self, bit_tree, i)
return s
Returns sum of arr[0..index]. This function assumes that the array is preprocessed and partial sums of array elements are stored in bit_tree[].
Returns sum of arr[0..index]. This function assumes that the array is preprocessed and partial sums of array elements are stored in bit_tree[].
Returns sum of arr [ 0 .. index ] . This function assumes that the array is preprocessed and partial sums of array elements are stored in bit_tree [] .
def get_sum(self, bit_tree, i):
        """
             Returns sum of arr[0..index]. This function assumes that the array is preprocessed and partial sums of array elements are stored in bit_tree[]. 
        """

        s = 0
      
        # index in bit_tree[] is 1 more than the index in arr[] 
        i = i+1
      
        # Traverse ancestors of bit_tree[index] 
        while i > 0: 
      
            # Add current element of bit_tree to sum 
            s += bit_tree[i] 
      
            # Move index to parent node in getSum View 
            i -= i & (-i) 
        return s
def get_sum ( self , bit_tree , i ) : s = 0 # index in bit_tree[] is 1 more than the index in arr[]  i = i + 1 # Traverse ancestors of bit_tree[index]  while i > 0 : # Add current element of bit_tree to sum  s += bit_tree [ i ] # Move index to parent node in getSum View  i -= i & ( - i ) return s