Compilare: user.cpp: In function ‘int main()’: user.cpp:22:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.in","r",stdin); ^ 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:25:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp: In function ‘void hip(int)’: user.cpp:11:5: warning: ‘fs’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[i]<fs)swap(v[i],v[i*2]); ^ user.cpp:13:5: warning: ‘fd’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[i]<fd)swap(v[i],v[i*2+1]);} ^