Compilare: user.cpp: In function ‘bool isGood(long int)’: user.cpp:49:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<O.size()-1;i++){ ^ user.cpp:50:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<O.size();j++){ ^ user.cpp: In function ‘int main()’: user.cpp:67:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("segmente.in","r",stdin); ^ user.cpp:68:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("segmente.out","w",stdout); ^ user.cpp:70:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&n); ^ user.cpp:72:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld %ld %ld",&x1,&y1,&x2,&y2); ^