Compilare: main.cpp: In function 'void build(int, int, int, int)': main.cpp:14:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {while(aib[tip].size()<=nod)aib[tip].push_back(0);aib[tip][nod-1]=c[l[tip][++nr]];} ~~~~~~~~~~~~~~~^~~~~ main.cpp: In function 'void dfs(int, int, int)': main.cpp:51:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp:57:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp:58:46: warning: 'aux' may be used uninitialized in this function [-Wmaybe-uninitialized] {vecin=v[nod][i];if(vecin==tata)continue;if(i!=aux)t[f[vecin]]=nod;else{l[f[vecin]].push_back(nod);f[nod]=f[vecin];poz[nod]=l[f[nod]].size();}} ^~