Compilare: user.cpp: In function ‘int main()’: user.cpp:130:42: warning: format ‘%s’ expects argument of type ‘char*’, but argument 4 has type ‘char (*)[25]’ [-Wformat=] sscanf(tmp, "%d %s", &optiune, &x); ^ user.cpp:117:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in", "r", stdin); ^ user.cpp:118:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out", "w", stdout); ^ user.cpp:122:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(tmp, 25, stdin); ^ user.cpp:148:30: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(tmp, 25, stdin); ^