Compilare: main.cpp: In function 'void ad_cuv(char*)': main.cpp:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(w);i++) ~^~~~~~~~~~ main.cpp: In function 'void delete_cuv(char*)': main.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(w)&&aux->fii[w[i]-'a']!=NULL;i++) ~^~~~~~~~~~ main.cpp: In function 'void print_nrcuv(char*)': main.cpp:54:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(w)&&aux->fii[w[i]-'a']!=NULL;i++) ~^~~~~~~~~~ main.cpp:58:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] g<<(aux->nr_cuvinte)*(i==strlen(w))<<'\n'; ~^~~~~~~~~~~ main.cpp: In function 'void prefix_maxim(char*)': main.cpp:64:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(w)&&aux->fii[w[i]-'a']!=NULL;aux=aux->fii[w[i]-'a'],i++); ~^~~~~~~~~~