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

Return to Revisions

R, (削除) 301 (削除ここまで) (削除) 289 (削除ここまで) (削除) 287 (削除ここまで) 273 bytes

Explanation.

Look up the index of the mass sorted atomic number in a UTF8 encoded hash string s. The hash is taken by taking the element name, encoding it as ASCII, multiplying by a 2-vector encoded with UTF-8 and modding three times in succession. The operator + is used for the UTF8 to integer vector conversion.

Encode the masses of the elements as a UTF8 encoded string of differences, packing 2 differences into each byte as 9*d1 + d2 where d1 is the difference of the nth element and d2 is the successive mass difference of the n+50th element. Then to retrieve the mass, take the corresponding position at the cumulative sum of the differences. This is shorter than a quadratic formula.

function(x)sum(c(o%%9,o%/%9)[1:match(sum(+x*+"")%%740%%623%%278,+'{ćWZ}èċæŸ+Ó>qÿƒ!2Eo&ē_
u1⁄28`h›’Hb‰1ĎŽ‹@-if9ÃÛ%ù]V‚:LkXlÙDRŠ•˜OU·m,Sμ5TËt6cC7#­/ąz1A')])
"+"=utf8ToInt
o=+"0%..%$%% 
p

&00(1"

Try it online!