Compilare: user.cpp: In function ‘void convex()’: user.cpp:42:9: warning: unused variable ‘min’ [-Wunused-variable] int min=1; ^ user.cpp: In function ‘int main()’: user.cpp:91:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&k); ^ user.cpp:95:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&v[i].x,&v[i].y); ^