Compilare: user.cpp: In constructor ‘Node::Node(int&)’: user.cpp:48:40: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(sons, NULL, sizeof(sons)); ^ user.cpp: In function ‘void Insert(const string&, const int&)’: user.cpp:70:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < s.size() ; ++ i) { ^ user.cpp: In function ‘void BFs()’: user.cpp:83:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < Q.size() ; ++ j) { ^ user.cpp: In function ‘int main()’: user.cpp:113:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(infile, "r", stdin); ^ user.cpp:114:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outfile, "w", stdout); ^