Compilare: main.cpp: In function 'void DFS(int)': main.cpp:13:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[a].size();j++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:22:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ main.cpp:25:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&x,&y); ^