Compilare: main.cpp: In function 'void DFS1(int)': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<G[k].size();++i) ~^~~~~~~~~~~~ main.cpp: In function 'void DFS2(int)': main.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<Gt[k].size();++i) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<ans[i].size();++j) ~^~~~~~~~~~~~~~ main.cpp:46:30: 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:49:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d",&x,&y); ^