Compilare: user.cpp: In function ‘int convex_hull()’: user.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=2;i<p.size();i++) ^ user.cpp: In function ‘int dynamic_prog()’: user.cpp:82:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (q=st[i]+1;q<p.size();q++) ^ user.cpp:87:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (q=st[i]+1;q<p.size();q++) ^ user.cpp: In function ‘int main()’: user.cpp:108:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&k); ^ user.cpp:111:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lf%lf",&x,&y); ^