Вопрос: this problem can be solved by pre-school children in 5-10 minutes, by programer — in 1 hour, by people with higher education … well, check it yourself!
| 8809 = 6; | 5555 = 0; |
| 7111 = 0; | 8193 = 3; |
| 2172 = 0; | 8096 = 5; |
| 6666 = 4; | 1012 = 1; |
| 1111 = 0; | 7777 = 0; |
| 3213 = 0; | 9999 = 4; |
| 7662 = 2; | 7756 = 1; |
| 9313 = 1; | 6855 = 3; |
| 0000 = 4; | 9881 = 5; |
| 2222 = 0; | 5531 = 0; |
| 3333 = 0; | 2581 = ? |
Ответ: 2.
Пояснение: шаблон решения — число кружков в каждой серии представленных чисел.