Compilare: user.cpp: In member function ‘bool Buffer::isDigit(char)’: user.cpp:35:22: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] return c >= '0' & c <= '9'; ^ user.cpp: In function ‘int main()’: user.cpp:85:34: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] Buffer cin("rrmst.in",1000000); ^ user.cpp:97:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<G.size();i++){ ^ user.cpp:105:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<D[i].size();j++){ ^ user.cpp:86:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rrmst.out","w",stdout); ^ user.cpp: In constructor ‘Buffer::Buffer(char*, long int)’: user.cpp:15:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(fileName,"r",stdin); ^ user.cpp: In member function ‘void Buffer::reFill()’: user.cpp:38:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(&Buff[0],1,maxBuf,stdin); pos = 0; ^