Compilare: user.cpp: In function ‘int minim()’: user.cpp:70:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ver<O.size()) rez=min(rez,O[ver].first); ^ user.cpp: In function ‘int main()’: user.cpp:99:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;ver<O.size();++ver) ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:38:51: 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, input_file); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:9:47: 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, input_file); ^