# Answer to Question #17305 in C++ for sahar

Question #17305

I want to determine how many items in each list are twice some other item in the same list?

For example, given the list

1 4 3 2 9 7 18 22

I should answer 3, as 2 is twice 1, 4 is twice 2, and 18 is twice 9.

for example this input

1 4 3 2 9 7 18 22 0

2 4 8 10 0

7 5 11 13 1 3 0

-1

output is

3

2

0

For example, given the list

1 4 3 2 9 7 18 22

I should answer 3, as 2 is twice 1, 4 is twice 2, and 18 is twice 9.

for example this input

1 4 3 2 9 7 18 22 0

2 4 8 10 0

7 5 11 13 1 3 0

-1

output is

3

2

0

Expert's answer

Dear visitor

Unfortunately, the statement of your question is a bit confusing.

Please clarify the statement so we could help you

Unfortunately, the statement of your question is a bit confusing.

Please clarify the statement so we could help you

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