Compilare: user.cpp: In function ‘bool comppct(pct, pct)’: user.cpp:12:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return x.x<y.x||x.x==y.x&&x.y<y.y; ^ user.cpp: In function ‘int main()’: user.cpp:25:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:28:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lf%lf",&P[i].x,&P[i].y); ^