Compilare: main.cpp: In function 'double bellman(int)': main.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[x.nod].size(); ++i) { ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:16: warning: unused variable 'u' [-Wunused-variable] double ans,u; ^ main.cpp:55:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ main.cpp:57:40: 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,&t); ^