Compilare: main.cpp: In function 'void DFS(int)': main.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'void DFS2(int)': main.cpp:33:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'void DFS3(int)': main.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:88:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[a].size();i++) ~^~~~~~~~~~~~ main.cpp:93:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[b].size();i++) ~^~~~~~~~~~~~