Compilare: user.cpp: In function ‘int main()’: user.cpp:54:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();i++) ^ user.cpp:21:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %lf " ,&n,&l); ^ user.cpp:23:91: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lf %lf %lf %lf %lf " ,&vec[i].a,&vec[i].b,&vec[i].k,&vec[i].q,&vec[i].v); ^