# Case 2: Add a link later
0 ADD_NODE 1
0 ADD_NODE 2
0 ADD_NODE 3
0 ADD_LINK 1 2 10
0 ADD_LINK 2 3 10

100 ADD_LINK 1 3 1
1000 DRAW_PATH 1 3

1001 CHANGE_LINK 1 3 21
2000 DRAW_PATH 1 3