We’ve updated our Terms of Service. A new AI Addendum clarifies how Stack Overflow utilizes AI interactions.

Return to Revisions

MATL, 14 bytes

1&)"V@VX&nv@]x

Try it online!

Thanks @LuisMendo for saving a byte. Explanation:

1&) % Implicitly take input. 'Pop' the first item from the input on the stack.
 " ] % Main 'for' loop, to loop over the rest of the input.
 V % Stringify previous (or first) iten from the input.
 @V % Push current number, convert to string
 X& % Intersect with stringified number already on the stack.
 n % Count the size of the intersection
 @ % Push the current number again for the intersection in the next loop.