Compilare: user.cpp: In function ‘bool compara(std::string&, std::string&)’: user.cpp:17:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < q.size(); i++) { ^ user.cpp:20:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz == p.size()) ^ user.cpp: In function ‘bool cmp(std::string, std::string)’: user.cpp:29:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:65:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < B[k].size(); j++) { ^ user.cpp:42:13: warning: unused variable ‘x’ [-Wunused-variable] int n,p,x,y,poz=-1,poz2=-1,ct=0,ok; ^ user.cpp:42:15: warning: unused variable ‘y’ [-Wunused-variable] int n,p,x,y,poz=-1,poz2=-1,ct=0,ok; ^ user.cpp:42:17: warning: unused variable ‘poz’ [-Wunused-variable] int n,p,x,y,poz=-1,poz2=-1,ct=0,ok; ^ user.cpp:42:24: warning: unused variable ‘poz2’ [-Wunused-variable] int n,p,x,y,poz=-1,poz2=-1,ct=0,ok; ^