Compilare: user.cpp: In function ‘void godown(int)’: user.cpp:67:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nod*2 > heap.size()-1) ^ user.cpp:69:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] nextnod = nod*2 + (nod*2+1<=heap.size()-1 and v[heap[nod*2]] > v[heap[nod*2+1]]); ^ user.cpp: In function ‘int main()’: user.cpp:19:36: 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:20:38: 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:23:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:26:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&cod); ^ user.cpp:31:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^