问题
input:
A 4
B 3
C 2
output:
A
A
A
A
B
B
B
C
C
Using only one formula. no code please.
回答1:
=ArrayFormula(IFERROR(TRANSPOSE(SPLIT(CONCATENATE(REPT(A:A&CHAR(9);B:B));CHAR(9)))))
来源：https://stackoverflow.com/questions/17897310/array-expand-with-one-formula