Compilare: main.cpp: In function 'int dfs3(int)': main.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G2[x].size();i++) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:77:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<aux.size();i++) ~^~~~~~~~~~~ main.cpp:89:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G1[i].size();j++) ~^~~~~~~~~~~~~ main.cpp:52:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ main.cpp:56:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&m); ^ main.cpp:60:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^