Compilare: main.cpp: In constructor 'Trie::Trie()': main.cpp:21:37: warning: passing NULL to non-pointer argument 2 of 'void* memset(void*, int, size_t)' [-Wconversion-null] memset(son, NULL, sizeof son); ^ main.cpp: In function 'int main()': main.cpp:76:27: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(a, NMAX + 3, in); ^ main.cpp:78:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &n); ^ main.cpp:80:35: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(aux, LENMAX + 3, in); ^