Compilare: user.cpp: In function ‘void pushDown(int)’: user.cpp:33:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i * 2 > dim) ^ user.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i * 2 + 1 > dim) { ^ user.cpp: In function ‘int main()’: user.cpp:88:35: 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:89:37: 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); ^