/in/foo.cc:9: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
    9 | #pragma warning(disable:4996)
      | 
/in/foo.cc: In function 'int main()':
/in/foo.cc:62:23: warning: 'void* memset(void*, int, size_t)' clearing an object of non-trivial type 'struct datas'; use assignment or value-initialization instead [-Wclass-memaccess]
   62 |                 memset(l[0], 0, (n + 1) * sizeof(datas));
      |                 ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:13:8: note: 'struct datas' declared here
   13 | struct datas {
      |        ^~~~~