Compilare: user.cpp: In function ‘void bellmanford()’: user.cpp:31:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[x.d].size();i++) ^ user.cpp:20:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,y,temp; drum x,z; ^ user.cpp: In function ‘int main()’: user.cpp:55:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&k); ^ user.cpp:57:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&p[i]); ^ user.cpp:58:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&m); ^ user.cpp:61:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d %d",&y,&x.d,&x.cost,&x.cost_w); ^