Compilare: main.cpp: In function 'bool dfs(int, int)': main.cpp:22:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(index == sir.size()) ~~~~~~^~~~~~~~~~~~~ main.cpp:25:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<=sir.size();j++) ~^~~~~~~~~~~~