Compilare: user.cpp: In function ‘void bi(int, int, int)’: user.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[node].size();i++){ ~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:52:10: warning: statement has no effect [-Wunused-value] for(m;m>0;m--){ ^ user.cpp:60:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[i].size();j++){ ~^~~~~~~~~~~~ user.cpp:51:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ user.cpp:53:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&i,&j); ^