The problem of borrowing arrows from grass boats?

Zhuge Liang borrowed arrows not only because of the lack of arrows in the army, but because (Zhou Yu was jealous of Zhuge Liang's talent and asked Zhuge Liang to build 100 thousand arrows in three days on the pretext of the lack of arrows in the army. As a result, the straw boat borrowed an arrow and handed in more than 100 thousand arrows in three days, which defeated Zhou Yu's trick. In the end, this result mainly depends on Zhuge Liang's (cleverness)