Compilare: user.cpp: In function ‘int main()’: user.cpp:55:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < h[v[st]].size(); i ++ ){ ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:13:57: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, sizeof(char), inputFile); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:23:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, inputFile); ^