Compilare: main.cpp: In function 'void rec(int, int, int)': main.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:23:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:34:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<q.size();i+=2) ~^~~~~~~~~ main.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i+1<q.size();i+=2) ~~~^~~~~~~~~