70         for (unsigned col = 0; col < BOARD_DIM; ++col) {  in print_board()  local
71             printf(" %d", b[row * BOARD_DIM + col].solved_element);  in print_board()
72             if (col == 2 || col == 5)  in print_board()
83         for (unsigned col = 0; col < BOARD_DIM; ++col) {  in print_potential_board()  local
84             if (b[row * BOARD_DIM + col].solved_element)  in print_potential_board()
85                 printf("  %4d ", b[row * BOARD_DIM + col].solved_element);  in print_potential_board()
87                 printf(" [%4d]", b[row * BOARD_DIM + col].potential_set);  in print_potential_board()
88             if (col == 2 || col == 5)  in print_potential_board()
121 bool in_row(const std::vector<board_element>& b, unsigned row, unsigned col, unsigned short p) {  in in_row()  argument
123         if (c != col && b[row * BOARD_DIM + c].solved_element == p)  in in_row()
128 bool in_col(const std::vector<board_element>& b, unsigned row, unsigned col, unsigned short p) {  in in_col()  argument
130         if (r != row && b[r * BOARD_DIM + col].solved_element == p)  in in_col()
135 bool in_block(const std::vector<board_element>& b, unsigned row, unsigned col, unsigned short p) {  in in_block()  argument
136     unsigned b_row = row / 3 * 3, b_col = col / 3 * 3;  in in_block()
139             if (!(i == row && j == col) && b[i * BOARD_DIM + j].solved_element == p)  in in_block()
148             unsigned row = i / BOARD_DIM, col = i % BOARD_DIM;  in calculate_potentials()  local
150                 if (!in_row(b, row, col, potential) && !in_col(b, row, col, potential) &&  in calculate_potentials()
151                     !in_block(b, row, col, potential))  in calculate_potentials()
162             unsigned row = i / BOARD_DIM, col = i % BOARD_DIM;  in valid_board()  local
163             if (in_row(b, row, col, b[i].solved_element) ||  in valid_board()
164                 in_col(b, row, col, b[i].solved_element) ||  in valid_board()
165                 in_block(b, row, col, b[i].solved_element))  in valid_board()