Compilare: main.cpp: In function 'void dfs(int)': main.cpp:22:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[k].size(); ++i) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ main.cpp:51:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&x); ^ main.cpp:65:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n1, &n2); ^