1
hard
0
0
1
0
0
0
0
0
1
1
2
0
2
1
1
0
0
0
1
1
1
4
2
3
3
2
2
2
1
1
0
0
1
0
0
1
0
0
0
1
0
1
1
1
1
1
1
1
0
0
1
0
2
1
1
1
2
2
3