Compilare: user.cpp: In function ‘void rec(char, int)’: user.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k>=a.size() || ok==1)return; ^ user.cpp:19:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(q=0,k=kk;q<v[car-'A'+1][j].size();q++,k++) ^ user.cpp:37:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k>a.size()) ^ user.cpp:45:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(kk==0)if(ch==a.size())ok=1; ^ user.cpp: In function ‘int main()’: user.cpp:76:13: warning: unused variable ‘i’ [-Wunused-variable] int i=0; ^