[EASY]
7
1
9
3
8
4
6
9
2
4
1
5
6
8
4
9
3
4
3
2
9
1
5
7
6
1
8
4
6
2
3
4
7
3
7
1
Solution
7
1
2
9
6
4
8
5
3
3
8
4
7
1
5
6
2
9
6
9
5
3
8
2
4
1
7
1
5
6
8
4
7
9
3
2
8
4
3
2
9
1
5
7
6
2
7
9
5
3
6
1
8
4
4
6
8
1
2
3
7
9
5
5
2
1
4
7
9
3
6
8
9
3
7
6
5
8
2
4
1
>> NEW:
easy
medium
hard
>> JSON:
easy
medium
hard
>> TXT:
easy
medium
hard
>>
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