Compilare: user.cpp: In function ‘void readdata()’: user.cpp:17:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:20:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&v[i].x,&v[i].y); ^ user.cpp: In function ‘int solve()’: user.cpp:44:13: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] s=fabs(s*0.5); ^