1000 
1000
400
100
+109
1
2
1000
1000
400
100
+170
1000
1000
400
100
+33
xxd
4
1
4
1
1000
1000
400
100
+18
1000
1000
400
100
+71
1000
1000
400
100
+160
1000
1000
400
100
+34
1000
1000
400
100
+47
| 1 | 2 |