Compilare: user.cpp: In member function ‘bool cmp::operator()(const p&, const p&) const’: user.cpp:31:33: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return a.dr<b.dr||a.dr==b.dr&&a.x<b.x; ^ user.cpp: In function ‘int main()’: user.cpp:76:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("timbre.in","r",stdin); ^ user.cpp:77:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("timbre.out","w",stdout); ^ user.cpp:79:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ^ user.cpp:82:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^