这是
`JAG Practice Contest for ACM-ICPC Asia Regional 2015-E-Shifting a Matrix`
by _caiji_ @ 2021-03-25 21:11:36
@[caijianhong](/user/390033) 啥意思
by 数星星的二哈 @ 2021-03-25 21:12:24
@[数星星的二哈](/user/426724) 点开题目来源看题
by _caiji_ @ 2021-03-25 21:14:04