Compilare: user.cpp: In member function ‘void CronHeap::pushDown(unsigned int)’: user.cpp:59:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((i << 1) + 1 <= dim && vect[(i << 1) + 1] < vect[(i << 1)] && vect[i] > vect[(i << 1) + 1]) ^ user.cpp:61:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((i << 1) <= dim && vect[i] > vect[(i << 1)]) ^ user.cpp: In function ‘std::ostream& operator<<(std::ostream&, CronHeap&)’: user.cpp:94:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (h.posInHeap[i] != -1) ^ user.cpp: In function ‘int main()’: user.cpp:106:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n; ++i) { ^ user.cpp:103:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.in", "r", stdin); ^ user.cpp:104:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.out", "w", stdout); ^ user.cpp:105:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:107:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &op1); ^ user.cpp:112:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &op2); ^