Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1[nod].size();++i) ~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v2[nod].size();++i) ~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs3(int, int, int)': main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1[nod].size();++i) ~^~~~~~~~~~~~~~~ main.cpp:36:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v1[nod][i]==st&&nr>gioto.size()) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:74:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<gioto.size();++i) g<<gioto[i]<<' '; ~^~~~~~~~~~~~~