Compilare: main.cpp: In function 'int maxval(int, int)': main.cpp:27:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos==sons[nod].size()-1) ~~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs1(int, int)': main.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sons[nod].size();i++) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<sons[i].size();j++) ~^~~~~~~~~~~~~~~