Compilare: main.cpp: In function 'void dfs(int)': main.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<w[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:26:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&k); ^ main.cpp:28:59: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&v[i].first,&v[i].second.first); ^