Compilare: user.cpp: In function ‘int main()’: user.cpp:47:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<g[j].size(); k++) ^ user.cpp:24:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d%d",&n,&m); ^ user.cpp:28:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d%d%d",&a,&b,&cost); ^