Compilare: user.cpp: In function ‘int main()’: user.cpp:16:19: warning: NULL used in arithmetic [-Wpointer-arith] for(i=0;c[i]!=NULL;++i) ^ user.cpp:35:19: warning: NULL used in arithmetic [-Wpointer-arith] for(i=0;w[i]!=NULL;++i) ^ user.cpp:39:16: warning: unused variable ‘dr’ [-Wunused-variable] int st,k,q,dr,SS,DD,L=strlen(d); ^ user.cpp:39:19: warning: variable ‘SS’ set but not used [-Wunused-but-set-variable] int st,k,q,dr,SS,DD,L=strlen(d); ^ user.cpp:39:22: warning: variable ‘DD’ set but not used [-Wunused-but-set-variable] int st,k,q,dr,SS,DD,L=strlen(d); ^ user.cpp:81:11: warning: unused variable ‘r’ [-Wunused-variable] int R,r; ^