Compilare: user.cpp: In function ‘trie* add(trie*, char*)’: user.cpp:35:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->nxt[v[0]]) ^ user.cpp:36:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->nrtot-=nod->nxt[v[0]]->nrtot; ^ user.cpp:38:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->nxt[v[0]]=add(nod->nxt[v[0]],v+1); ^ user.cpp:38:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->nxt[v[0]]=add(nod->nxt[v[0]],v+1); ^ user.cpp:39:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->nrtot+=nod->nxt[v[0]]->nrtot; ^ user.cpp: In function ‘int main()’: user.cpp:94:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:95:28: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(input,6<<20,1,in); ^