Compilare: main.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^~~~~~ main.cpp:2:40: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] int p=10,s,i,j,A,B,C,D,x[15]={-2};main(){std::ifstream c("telefon.in");std::ofstream o("telefon.out");std::string N;for(c>>N;i<=N.length();i++)x[i]=N[i]-48,x[i]?:x[i]=11,i-N.length()?:x[i]=12;for(;j<15*x[j]>0;p=x[j++]){p==x[N.length()]?s=12:s=x[j];A=--p%3;B=--s%3;C=p/3;D=s/3;if(A<B)o<<" DR "<<B-A;if(A>B)o<<" ST "<<A-B;if(C<D)o<<" J "<<D-C;if(C>D)o<<" S "<<C-D;if(s!=11)o<<" A ";}} ^ main.cpp: In function 'int main()': main.cpp:2:127: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int p=10,s,i,j,A,B,C,D,x[15]={-2};main(){std::ifstream c("telefon.in");std::ofstream o("telefon.out");std::string N;for(c>>N;i<=N.length();i++)x[i]=N[i]-48,x[i]?:x[i]=11,i-N.length()?:x[i]=12;for(;j<15*x[j]>0;p=x[j++]){p==x[N.length()]?s=12:s=x[j];A=--p%3;B=--s%3;C=p/3;D=s/3;if(A<B)o<<" DR "<<B-A;if(A>B)o<<" ST "<<A-B;if(C<D)o<<" J "<<D-C;if(C>D)o<<" S "<<C-D;if(s!=11)o<<" A ";}} ~^~~~~~~~~~~~ main.cpp:2:199: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses] int p=10,s,i,j,A,B,C,D,x[15]={-2};main(){std::ifstream c("telefon.in");std::ofstream o("telefon.out");std::string N;for(c>>N;i<=N.length();i++)x[i]=N[i]-48,x[i]?:x[i]=11,i-N.length()?:x[i]=12;for(;j<15*x[j]>0;p=x[j++]){p==x[N.length()]?s=12:s=x[j];A=--p%3;B=--s%3;C=p/3;D=s/3;if(A<B)o<<" DR "<<B-A;if(A>B)o<<" ST "<<A-B;if(C<D)o<<" J "<<D-C;if(C>D)o<<" S "<<C-D;if(s!=11)o<<" A ";}} ~^~~~~~~~