请注意数据范围
by sdsswyd @ 2024-01-09 20:37:44
@[sybnb](/user/995948) `((l+r)*(r-l+1)/2)%9` 会炸
by __Tonycyt__ @ 2024-01-09 20:39:12
谢谢各位大佬
by sybnb @ 2024-01-10 18:45:27