Compilare: user.cpp: In function ‘int main()’: user.cpp:109:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("sequencequery.in" ,"r", stdin ); ^ user.cpp:110:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("sequencequery.out","w", stdout); ^ user.cpp:112:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &M); ^ user.cpp:116:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &X); ^ user.cpp:124:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &X, &Y); ^ user.cpp: In function ‘nod query(int, int, int, int, int)’: user.cpp:103:16: warning: ‘*((void*)& answer2 +12)’ may be used uninitialized in this function [-Wmaybe-uninitialized] return answer; ^ user.cpp:103:16: warning: ‘*((void*)& answer2 +8)’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:103:16: warning: ‘*((void*)& answer2 +4)’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:103:16: warning: ‘answer2’ may be used uninitialized in this function [-Wmaybe-uninitialized]