Compilare: user.cpp: In function ‘int main()’: user.cpp:110:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("maxq.in" ,"r", stdin ); ^ user.cpp:111:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("maxq.out","w", stdout); ^ user.cpp:113:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &N); ^ user.cpp:117:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &X); ^ user.cpp:123:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &M); ^ user.cpp:127:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &cod, &X, &Y); ^ user.cpp: In function ‘nod query(int, int, int, int, int)’: user.cpp:104:16: warning: ‘*((void*)& answer2 +24)’ may be used uninitialized in this function [-Wmaybe-uninitialized] return answer; ^ user.cpp:104:16: warning: ‘*((void*)& answer2 +16)’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:104:16: warning: ‘*((void*)& answer2 +8)’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:104:16: warning: ‘answer2’ may be used uninitialized in this function [-Wmaybe-uninitialized]