Compilare: main.cpp: In function 'void dfs(int)': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G1[node].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G2[node].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs3(int)': main.cpp:66:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G3[node].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:98:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G1[i].size();j++) ~^~~~~~~~~~~~~ main.cpp:112:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<G2[i].size();j++) ~^~~~~~~~~~~~~ main.cpp:120:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v.size();j++) ~^~~~~~~~~ main.cpp:136:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G2[i].size();j++) ~^~~~~~~~~~~~~ main.cpp:168:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ~^~~~~~~~~~~