Compilare: user.cpp: In function ‘int main()’: user.cpp:10:90: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kinetic.in","r",stdin),freopen("kinetic.out","w",stdout),scanf("%d%d",&n,&m); ^ user.cpp:10:90: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:10:90: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:12:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a[i].x,&a[i].y),h[i]=p[i]=i; ^ user.cpp:19:75: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&j,&v,&z[i].x),b[i]=min(j,v),c[i]=max(j,v),z[i].y=i; ^