Compilare: user.cpp: In function ‘int main()’: user.cpp:70:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ^ user.cpp:40:56: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d%d%d",&n,&m,&is,&js,&ifn,&jfn); ^ user.cpp:43:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&a[i][j]); ^ user.cpp:80:31: warning: ‘sf’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf (fout,"%d",drm[sf]); ^ user.cpp:67:13: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] f[start]=1; ^