text: Queries to calculate sum of array elements present at every Yth index starting from the index X | Function to Find the sum of arr [ x ] + arr [ x + y ] + arr [ x + 2 * y ] + ... for all queries ; Iterate over each query ; Stores the sum of arr [ x ] + arr [ x + y ] + arr [ x + 2 * y ] + ... ; Traverse the array and calculate the sum of the expression ; Update sum ; Update x ; Driver Code
code: def querySum ( arr , N , Q , M ) : NEW_LINE INDENT for i in range ( M ) : NEW_LINE INDENT x = Q [ i ] [ 0 ] NEW_LINE y = Q [ i ] [ 1 ] NEW_LINE sum = 0 NEW_LINE while ( x < N ) : NEW_LINE INDENT sum += arr [ x ] NEW_LINE x += y NEW_LINE DEDENT print ( sum , end = " ▁ " ) NEW_LINE DEDENT DEDENT if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT arr = [ 1 , 2 , 7 , 5 , 4 ] ; NEW_LINE Q = [ [ 2 , 1 ] , [ 3 , 2 ] ] NEW_LINE N = len ( arr ) NEW_LINE M = len ( Q ) NEW_LINE querySum ( arr , N , Q , M ) NEW_LINE DEDENT