Compilare: user.cpp: In function ‘void Taie(int)’: user.cpp:43:5: warning: unused variable ‘key’ [-Wunused-variable] int key; ^ user.cpp: In function ‘int main()’: user.cpp:51:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j,cod,x,nr=0; ^ user.cpp:51:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,cod,x,nr=0; ^ user.cpp:52:36: 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:53:38: 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:54:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:56:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&cod); ^ user.cpp:60:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^