Compilare: main.cpp: In function 'int main()': main.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<graph[i].size();++j) ~^~~~~~~~~~~~~~~~ main.cpp:44:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=0;l<graph[k].size();++l) ~^~~~~~~~~~~~~~~~ main.cpp:19:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&c,&n,&m); ^ main.cpp:22:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^