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