Compilare: user.cpp: In function ‘int main()’: user.cpp:63:11: warning: unused variable ‘fin’ [-Wunused-variable] FILE *fin=freopen("alee.in","r",stdin); ^ user.cpp:64:11: warning: unused variable ‘fout’ [-Wunused-variable] FILE *fout=freopen("alee.out","w",stdout); ^ user.cpp:65:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&M); ^ user.cpp:70:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&p.x,&p.y); ^ user.cpp:75:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ",&pi.x,&pi.y); ^ user.cpp:76:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&pf.x,&pf.y); ^