Unscrupulous version: 20. I don’t know if it’s 77 or 78. I don’t care how many years it is. In short, it’s probably because a certain super-calculated a certain problem and then some damage occurred in the data city, and then a certain repair block needs to use various targets in the map. Paths to reach corrupted data to fix problems. Serious version: In the distant future, cities around the world are managed by the most powerful supercomputer in history, the "Woyebudge Road". And on a certain day, some data was lost, which caused some city functions to be lost and urgently needed to be repaired. As a powerful self-repairing block, you need to use the given moving path fragments to achieve the goal, collect more moving path fragments, solve the obstacles in the middle, and finally reach the destination and restore the data.