Compilare: main.cpp: In function 'void dfs(int)': main.cpp:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graf[nod].size();i++) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:72:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<graf[st[i]].size();j++) ~^~~~~~~~~~~~~~~~~~~ main.cpp:84:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<grafi[st[i]].size();j++) ~^~~~~~~~~~~~~~~~~~~~