f: 0, l: 8
-1
5
f: 0, l: 3
-1
2
f: 0, l: 0
-1
1
f: 2, l: 3
-1
2
f: 2, l: 0
-1
1
f: 2, l: -1
-1
1
f: 2, l: -1
-1
1