1. On the board, there are 99 ones written in a row. Is it possible to place + and - signs between some of them so that the value of the resulting expression is equal to 2017?
Answer: It is possible.

Solution. The signs can be arranged as follows:

$1111-111+1111-111+11+11-1-1-1-1-1+1-1+1-1+\ldots+1-1$.

Evaluation. 12 points for a correct example.