Compilare: user.cpp: In member function ‘bool Buffer::isDigit(char)’: user.cpp:39:22: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] return c >= '0' & c <= '9'; ^ user.cpp: In function ‘void dfsF(long int)’: user.cpp:66:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<list[nod].size();i++){ ^ user.cpp: In function ‘void dfsB(long int)’: user.cpp:76:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<rev[nod].size();i++){ ^ user.cpp: In function ‘long int searchCol(long int)’: user.cpp:85:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<Comp[act].size();i++){ ^ user.cpp: In function ‘bool tryCol(long int, long int)’: user.cpp:103:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<Comp[act].size();i++){ ^ user.cpp:113:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long j=0;j<list[nod].size();j++){ ^ user.cpp: In function ‘int main()’: user.cpp:125:35: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] Buffer cin("2sat.in",1024*1024); ^ user.cpp:126:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("2sat.out","w",stdout); ^ user.cpp: In constructor ‘Buffer::Buffer(char*, long int)’: user.cpp:14:40: 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:42:43: 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; ^