Compilare: user.cpp: In function ‘void insert(Trie*, int)’: user.cpp:81:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(v[r] != str[lvl]) ^ user.cpp:83:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod -> son[r] == NULL) ^ user.cpp:84:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod -> son[r] = new Trie; ^ user.cpp:85:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] insert(nod -> son[r], lvl + 1); ^ user.cpp:90:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod -> son[win[i]] != NULL) ^ user.cpp:91:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod -> dp[i] = nod -> son[win[i]] -> cnt * w; ^ user.cpp: In function ‘char nextch()’: user.cpp:12:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAXBUF, fi); ^