Compilare: user.cpp: In function ‘void add_hash(hash_value)’: user.cpp:25:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Hash[pos].size(); i ++ ) ^ user.cpp: In function ‘int main()’: user.cpp:38:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "regiuni.in" , "r", stdin ); ^ user.cpp:39:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "regiuni.out", "w", stdout ); ^ user.cpp:41:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d", &N, &M ); ^ user.cpp:43:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d %d", &P[i].a, &P[i].b, &P[i].c ); ^ user.cpp:46:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d", &x, &y ); ^