Compilare: main.cpp: In function 'void dfs(trie*)': main.cpp:37:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<nod->v.size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%s\n",initial); ^ main.cpp:49:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d\n",&n); ^ main.cpp:53:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%s\n",s[i]); ^