Compilare: user.cpp: In function ‘void pune(tri, int)’: user.cpp:19:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f->t[c] == NULL) f->t[c] = new trie; ^ user.cpp:19:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f->t[c] == NULL) f->t[c] = new trie; ^ user.cpp:20:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] pune(f->t[c],i+1); ^ user.cpp: In function ‘int main()’: user.cpp:28:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dictree.in","r",stdin); ^ user.cpp:29:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int t;scanf("%d\n",&t); ^ user.cpp:32:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s+1); ^ user.cpp:36:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dictree.out","w",stdout); ^