B. Desene in zapada

Langa locul in care s-au oprit, colegii vad un desen in zapada. Care este numarul minim de linii care trebuie sterse in zapada astfel incat sa nu mai ramana patrate (indiferent de marime)?

Sursa: Brilliant (adaptare Ruxandra F. Olimid)

B. Snow drawings

Next to the place where they stopped, they see a drawing in the snow. What is the minimum number of lines to delete in the snow so that no squares remain (regardless of size)?

Source: Brilliant (adaptation Ruxandra F. Olimid)