For bosses to explain the three questions!
I made the first questions to begin from 17 orz, Spaces should also calculate a
Don't know much about the negative index, behind the two sent from right to left, left most is 1, but this way I do it is not the value!

CodePudding user response:

There is no problem ah

CodePudding user response:

refer to the second floor????? No?????? Response:

no problem ah

?

CodePudding user response:

STR [start: end: step]