Compilare: user.cpp: In function ‘int inserth(int)’: user.cpp:20:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[key].size(); ++i) { ^ user.cpp: In function ‘int deleteh(int)’: user.cpp:33:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[key].size(); ++i) { ^ user.cpp: In function ‘int findh(int)’: user.cpp:45:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[key].size(); ++i) { ^ user.cpp: In function ‘int inserth(int)’: user.cpp:27:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int deleteh(int)’: user.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int findh(int)’: user.cpp:52:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:56:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r",stdin); ^ user.cpp:57:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT,"w",stdout); ^ user.cpp:58:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:60:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &comanda, &x); ^