Compilare: main.cpp: In function 'nod* del_arb(nod*)': main.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<c->v.size(); i+=2) ~^~~~~~~~~~~~ main.cpp:59:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+1<c->v.size()) ~~~^~~~~~~~~~~~ main.cpp: In function 'void join(int, int, int)': main.cpp:81:23: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(h[nod1]=h[nod2]) ^