超过int范围了
```cpp
if(!(a[i][j]%=k))
++ans;
```
by wuzhaoxin @ 2018-10-23 15:40:29
@[MrLi](/space/show?uid=28195) 你要先全算出来再用前缀和，不然会TLE
by wuzhaoxin @ 2018-10-23 15:42:10
@[wuzhaoxin](/space/show?uid=70310) 感谢大佬！！！
by hllh @ 2018-10-23 15:48:12