Correct

绞尽脑汁

/ jiǎo jìn nǎozhī / 
Strokes

Definition

to rack one's brains

Example

Definition

rack/cudgel one's brains; call forth all the faculties of the mind; ransack one's brains (about sth)

1
Jiǎojìnnǎozhī
绞尽脑汁
xiǎng
想
bànfǎ
办法

rack one's brains for a solution

2
Jiǎojìnnǎozhī
绞尽脑汁
jiějué
解决
wèntí
问题

worry out a problem