Compilare: user.cpp: In function ‘bool bellmanford()’: user.cpp:53:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();++i){ ^ user.cpp: In function ‘void read()’: user.cpp:83:32: 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:87:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d", &x, &y, &c); ^