fix 9.40

`svec.resize(svec.size()+svec.size()/2);`
if read 1000 words,`svec.resize(1500)`,capacity is 1500
IMHO, It should like:

|reads|capacity|
|-------|-----------|
|256   |1024    |
|512   |1024    |
|1000 |2048    |
|1048 |2048    |