Compilare: main.cpp: In function 'void add_to_list(const int&)': main.cpp:28:10: warning: variable 'r' set but not used [-Wunused-but-set-variable] nod* r=p; ^ main.cpp: In function 'void add_to_hash(const int&)': main.cpp:66:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h[bucket].size();++i) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int hash_search(const int&)': main.cpp:81:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h[bucket].size();++i) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:89:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("take5.in", "r", stdin); ^ main.cpp:90:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &sum); ^ main.cpp:92:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^ main.cpp:151:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("take5.out", "w", stdout); ^