Compilare: user.cpp: In function ‘void solve()’: user.cpp:74:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(istep <= clen) ^ user.cpp: In lambda function: user.cpp:108:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + step >= clen) ^ user.cpp: In member function ‘void Parser::readNext()’: user.cpp:13:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF_SIZ, fin); ^