test20190911-night Posted on 2019-09-11 | Edited on 2019-09-12 $T_3$ 打了 $\mbox{5kb}$ ,前前后后打了 $7$ 个错误版本,还都过了大样例. Read more »
test20190911-am Posted on 2019-09-11 | Edited on 2019-09-12 $\mbox{difficulty gap}$ 稍微有点大. Read more »