13 18 C:UsersAdministratorDesktopCQ-420未命名4.cpp [Error] name lookup of 'i' changed for ISO 'for' scoping [-fpermissive]
原因
for(ri i=1;i<=n;i++) for(ri j=1;j<=m;j++); // 这里有分号 scanf("%d",&arr[i][j]);