Compilare: user.cpp: In function ‘int calc(int)’: user.cpp:47:14: warning: no return statement in function returning non-void [-Wreturn-type] p=p*10+d[i];}} ^ user.cpp: In function ‘int add()’: user.cpp:59:16: warning: no return statement in function returning non-void [-Wreturn-type] h.insert(temp);} ^ user.cpp: In function ‘int back(int)’: user.cpp:66:14: warning: no return statement in function returning non-void [-Wreturn-type] back(poz+1);}} ^ user.cpp: In function ‘int main()’: user.cpp:68:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colectie.in","r",stdin); ^ user.cpp:69:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colectie.out","w",stdout); ^ user.cpp:71:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:76:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i][j]); ^