Compilare: user.cpp: In function ‘int df(long int, long int, long int)’: user.cpp:24:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:29:20: warning: format ‘%lli’ expects argument of type ‘long long int*’, but argument 2 has type ‘long int*’ [-Wformat=] scanf("%lli",&n); ^ user.cpp:33:29: warning: format ‘%lli’ expects argument of type ‘long long int*’, but argument 2 has type ‘long int*’ [-Wformat=] scanf("%lli",&H[i].v); ^ user.cpp:65:40: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long int’ [-Wformat=] printf("%d %lld\n", lg[i], b[i]); ^ user.cpp:27:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("huffman.in","r",stdin); ^ user.cpp:28:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("huffman.out","w",stdout); ^ user.cpp:29:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lli",&n); ^ user.cpp:33:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lli",&H[i].v); ^