Compilare: user.cpp: In member function ‘void nrx_hash::insert_hash(int, int, int)’: user.cpp:29:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < my_hash[pos].size(); i ++ ) { ^ user.cpp: In member function ‘int nrx_hash::count_hash(int, int, int)’: user.cpp:45:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < my_hash[pos].size(); i ++ ) { ^ user.cpp: In function ‘int main()’: user.cpp:61:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d %d", &N, &M ); ^ user.cpp:65:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d", &A[i][j] ); ^