Compilare: user.cpp: In function ‘void bellmanford()’: user.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:44:11: warning: unused variable ‘fout’ [-Wunused-variable] FILE *fout=fopen ("fmcm.out","w"); ^~~~ user.cpp:46:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&n,&m,&s,&d); ^ user.cpp:48:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&x,&y,&cap,&cost); ^