57     for (unsigned i = 0; i < BOARD_SIZE; ++i) {  in read_board()  local
59             init_values[i] = input;  in read_board()
61             fprintf(stderr, "sudoku: Error in input file at entry %d, assuming 0.\n", i);  in read_board()
62             init_values[i] = 0;  in read_board()
98     for (unsigned i = 0; i < BOARD_SIZE; ++i)  in init_board()  local
99         b[i].solved_element = b[i].potential_set = 0;  in init_board()
103     for (unsigned i = 0; i < BOARD_SIZE; ++i) {  in init_board()  local
104         b[i].solved_element = arr[i];  in init_board()
105         b[i].potential_set = 0;  in init_board()
110     for (unsigned i = 0; i < BOARD_SIZE; ++i)  in init_potentials()  local
111         b[i].potential_set = 0;  in init_potentials()
115     for (int i = BOARD_SIZE - 1; i >= 0; --i)  in fixed_board()  local
116         if (b[i].solved_element == 0)  in fixed_board()
137     for (unsigned i = b_row; i < b_row + 3; ++i)  in in_block()  local
139             if (!(i == row && j == col) && b[i * BOARD_DIM + j].solved_element == p)  in in_block()
145     for (unsigned i = 0; i < BOARD_SIZE; ++i) {  in calculate_potentials()  local
146         b[i].potential_set = 0;  in calculate_potentials()
147         if (!b[i].solved_element) { // element is not yet fixed  in calculate_potentials()
148             unsigned row = i / BOARD_DIM, col = i % BOARD_DIM;  in calculate_potentials()
152                     b[i].potential_set |= 1 << (potential - 1);  in calculate_potentials()
160     for (unsigned i = 0; i < BOARD_SIZE; ++i) {  in valid_board()  local
161         if (success && b[i].solved_element) { // element is fixed  in valid_board()
162             unsigned row = i / BOARD_DIM, col = i % BOARD_DIM;  in valid_board()
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()
174     for (unsigned i = 0; i < BOARD_SIZE; ++i) {  in examine_potentials()  local
175         if (b[i].solved_element == 0 && b[i].potential_set == 0) // empty set  in examine_potentials()
177         switch (b[i].potential_set) {  in examine_potentials()
179                 b[i].solved_element = 1;  in examine_potentials()
184                 b[i].solved_element = 2;  in examine_potentials()
189                 b[i].solved_element = 3;  in examine_potentials()
194                 b[i].solved_element = 4;  in examine_potentials()
199                 b[i].solved_element = 5;  in examine_potentials()
204                 b[i].solved_element = 6;  in examine_potentials()
209                 b[i].solved_element = 7;  in examine_potentials()
214                 b[i].solved_element = 8;  in examine_potentials()
219                 b[i].solved_element = 9;  in examine_potentials()