Compilare: user.cpp: In function ‘void df(int)’: user.cpp:18:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[k].size();i++) ^ user.cpp: In function ‘void bellmanford()’: user.cpp:43:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[x.c].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:63:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&p); ^ user.cpp:64:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:66:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&dist[i]); ^ user.cpp:69:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&x,&aux.d,&aux.c); ^