首先你没输出空格； 而且如果你酱紫写的话 ```cpp minn=min(minn,min(t,m-t+1)); ``` 而变量`minn`的值就一直会是`0`！！！ 所以应该酱紫写： ```cpp minn=max(minn,min(t,m-t+1)); ``` by Liveddd @ 2018-12-25 17:34:10