Compilare: user.cpp: In constructor ‘Trie::Trie()’: user.cpp:17: warning: unused variable ‘N’ user.cpp: In function ‘bool Check(std::vector<int, std::allocator<int> >&, int)’: user.cpp:41: warning: comparison between signed and unsigned integer expressions user.cpp:47: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void Read()’: user.cpp:79: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:81: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:85: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void Print()’: user.cpp:92: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:97: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:101: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result