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| 1 | - | This problem can be solved by pre-school children in 5-10 minutes, by programer - in 1 hour, by people with higher |
| 1 | + | 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! :) |
| 2 | - | education ... well, check it yourself! :) |
| 2 | + | |
| 3 | 7111=0 | |
| 4 | 2172=0 | |
| 5 | 6666=4 | |
| 6 | 1111=0 | |
| 7 | 3213=0 | |
| 8 | 7662=2 | |
| 9 | 9313=1 | |
| 10 | 0000=4 | |
| 11 | 2222=0 | |
| 12 | 3333=0 | |
| 13 | 5555=0 | |
| 14 | 8193=3 | |
| 15 | 8096=5 | |
| 16 | 7777=0 | |
| 17 | 9999=4 | |
| 18 | 7756=1 | |
| 19 | 6855=3 | |
| 20 | 9881=5 | |
| 21 | 5531=0 | |
| 22 | 2581=? |
