[没O2](https://www.luogu.com.cn/record/150161184)
[有O2](https://www.luogu.com.cn/record/150160355)
by wjt20111219 @ 2024-03-10 11:06:54
@[TPJ_XiaoJing](/user/1280061)
by wjt20111219 @ 2024-03-10 11:07:45
刚老师讲了，原因是`map[i][j]=map[i][j-1]+map[i-1][j];`可能会越界。原因已知，此贴结。
by wjt20111219 @ 2024-03-10 11:12:57