A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
To solve this problem, we need to count the total number of 8x8 binary matrices that do not contain any isolated 1s. A 1 is considered isolated if there are no other 1s in the up, down, left, or right positions. Here's a step-by-step breakdown of how we can implement this in C: 1. **Matrix Representation**: We will represent the 8x8 matrix using a 2D array of integers where each element can either be 0 or 1. 2. **Validating Isolated 1s**: We need to check each configuration of the matrix to ensure that there are no isolated 1s. 3. **Recursive Backtracking**: We can use a recursive backtracking approach to fill the matrix and count valid configurations. For each cell, we can either place a 0 or a 1 (if it does not create an isolated 1). 4. **Counting**: We will maintain a counter to track the number of valid configurations. Here is the C code that implements the above logic:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | #include <stdio.h> #define SIZE 8 int is_isolated(int matrix[SIZE][SIZE], int row, int col) { // Check up if (row > 0 && matrix[row - 1][col] == 1) return 0; // Check down if (row < SIZE - 1 && matrix[row + 1][col] == 1) return 0; // Check left if (col > 0 && matrix[row][col - 1] == 1) return 0; // Check right if (col < SIZE - 1 && matrix[row][col + 1] == 1) return 0; return 1; // It is isolated } int is_valid(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1 && is_isolated(matrix, i, j)) { return 0; // Found an isolated 1 } } } return 1; // No isolated 1s found } void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { if (is_valid(matrix)) { (*count)++; } return; } // Move to the next cell int next_row = col == SIZE - 1 ? row + 1 : row; int next_col = (col + 1) % SIZE; // Case 1: Place a 0 in the current cell matrix[row][col] = 0; count_unholy_matrices(matrix, next_row, next_col, count); // Case 2: Place a 1 in the current cell (only if it will not isolate) matrix[row][col] = 1; if (is_valid(matrix)) { count_unholy_matrices(matrix, next_row, next_col, count); } // Backtrack (not strictly necessary in this context, but good practice) matrix[row][col] = 0; // Reset to 0 before moving on } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize matrix to all zeros int count = 0; count_unholy_matrices(matrix, 0, 0, &count); printf("Total number of unholy 8x8 matrices: %d\n", count); return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | #include <stdio.h> #define SIZE 8 int is_isolated(int matrix[SIZE][SIZE], int row, int col) { // Check up if (row > 0 && matrix[row - 1][col] == 1) return 0; // Check down if (row < SIZE - 1 && matrix[row + 1][col] == 1) return 0; // Check left if (col > 0 && matrix[row][col - 1] == 1) return 0; // Check right if (col < SIZE - 1 && matrix[row][col + 1] == 1) return 0; return 1; // It is isolated } int is_valid(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1 && is_isolated(matrix, i, j)) { return 0; // Found an isolated 1 } } } return 1; // No isolated 1s found } void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { if (is_valid(matrix)) { (*count)++; } return; } // Move to the next cell int next_row = col == SIZE - 1 ? row + 1 : row; int next_col = (col + 1) % SIZE; // Case 1: Place a 0 in the current cell matrix[row][col] = 0; count_unholy_matrices(matrix, next_row, next_col, count); // Case 2: Place a 1 in the current cell (only if it will not isolate) matrix[row][col] = 1; if (is_valid(matrix)) { count_unholy_matrices(matrix, next_row, next_col, count); } // Backtrack (not strictly necessary in this context, but good practice) matrix[row][col] = 0; // Reset to 0 before moving on } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize matrix to all zeros int count = 0; count_unholy_matrices(matrix, 0, 0, &count); printf("Total number of unholy 8x8 matrices: %d\n", count); return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | #include <stdio.h> #define SIZE 8 int is_isolated(int matrix[SIZE][SIZE], int row, int col) { // Check up if (row > 0 && matrix[row - 1][col] == 1) return 0; // Check down if (row < SIZE - 1 && matrix[row + 1][col] == 1) return 0; // Check left if (col > 0 && matrix[row][col - 1] == 1) return 0; // Check right if (col < SIZE - 1 && matrix[row][col + 1] == 1) return 0; return 1; // It is isolated } int is_valid(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1 && is_isolated(matrix, i, j)) { return 0; // Found an isolated 1 } } } return 1; // No isolated 1s found } void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { if (is_valid(matrix)) { (*count)++; } return; } // Move to the next cell int next_row = col == SIZE - 1 ? row + 1 : row; int next_col = (col + 1) % SIZE; // Case 1: Place a 0 in the current cell matrix[row][col] = 0; count_unholy_matrices(matrix, next_row, next_col, count); // Case 2: Place a 1 in the current cell (only if it will not isolate) matrix[row][col] = 1; if (is_valid(matrix)) { count_unholy_matrices(matrix, next_row, next_col, count); } // Backtrack (not strictly necessary in this context, but good practice) matrix[row][col] = 0; // Reset to 0 before moving on } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize matrix to all zeros int count = 0; count_unholy_matrices(matrix, 0, 0, &count); printf("Total number of unholy 8x8 matrices: %d\n", count); return 0; } |
Total number of unholy 8x8 matrices: 1
Testing if the previous output contains the string 1121231537486377866
: False
A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
To solve the problem of counting the total number of "unholy" 8x8 binary matrices, we need to define what makes a matrix "unholy." A matrix is considered "unholy" if it contains no isolated 1s, meaning that every 1 must be adjacent (up, down, left, or right) to at least one other 1. We can approach this problem with a recursive backtracking algorithm. The idea is to build the matrix one row at a time, ensuring that every time we place a 1 in the matrix, we check that it won't create an isolated 1. Here’s how we can implement this in C:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | #include <stdio.h> #define SIZE 8 // Function to check if the current position is isolated int is_isolated(int matrix[SIZE][SIZE], int row, int col) { // Check the four cardinal directions if (row > 0 && matrix[row - 1][col] == 1) return 0; // Up if (row < SIZE - 1 && matrix[row + 1][col] == 1) return 0; // Down if (col > 0 && matrix[row][col - 1] == 1) return 0; // Left if (col < SIZE - 1 && matrix[row][col + 1] == 1) return 0; // Right return 1; // Isolated } // Recursive function to count unholy matrices void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { (*count)++; return; } if (col == SIZE) { count_unholy_matrices(matrix, row + 1, 0, count); return; } // Option 1: Place 0 matrix[row][col] = 0; count_unholy_matrices(matrix, row, col + 1, count); // Option 2: Place 1 matrix[row][col] = 1; if (!is_isolated(matrix, row, col)) { // Only proceed if it won't be isolated count_unholy_matrices(matrix, row, col + 1, count); } } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize the 8x8 matrix int count = 0; count_unholy_matrices(matrix, 0, 0, &count); printf("Total number of unholy 8x8 matrices: %d\n", count); return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | #include <stdio.h> #define SIZE 8 // Function to check if the current position is isolated int is_isolated(int matrix[SIZE][SIZE], int row, int col) { // Check the four cardinal directions if (row > 0 && matrix[row - 1][col] == 1) return 0; // Up if (row < SIZE - 1 && matrix[row + 1][col] == 1) return 0; // Down if (col > 0 && matrix[row][col - 1] == 1) return 0; // Left if (col < SIZE - 1 && matrix[row][col + 1] == 1) return 0; // Right return 1; // Isolated } // Recursive function to count unholy matrices void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { (*count)++; return; } if (col == SIZE) { count_unholy_matrices(matrix, row + 1, 0, count); return; } // Option 1: Place 0 matrix[row][col] = 0; count_unholy_matrices(matrix, row, col + 1, count); // Option 2: Place 1 matrix[row][col] = 1; if (!is_isolated(matrix, row, col)) { // Only proceed if it won't be isolated count_unholy_matrices(matrix, row, col + 1, count); } } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize the 8x8 matrix int count = 0; count_unholy_matrices(matrix, 0, 0, &count); printf("Total number of unholy 8x8 matrices: %d\n", count); return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | #include <stdio.h> #define SIZE 8 // Function to check if the current position is isolated int is_isolated(int matrix[SIZE][SIZE], int row, int col) { // Check the four cardinal directions if (row > 0 && matrix[row - 1][col] == 1) return 0; // Up if (row < SIZE - 1 && matrix[row + 1][col] == 1) return 0; // Down if (col > 0 && matrix[row][col - 1] == 1) return 0; // Left if (col < SIZE - 1 && matrix[row][col + 1] == 1) return 0; // Right return 1; // Isolated } // Recursive function to count unholy matrices void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { (*count)++; return; } if (col == SIZE) { count_unholy_matrices(matrix, row + 1, 0, count); return; } // Option 1: Place 0 matrix[row][col] = 0; count_unholy_matrices(matrix, row, col + 1, count); // Option 2: Place 1 matrix[row][col] = 1; if (!is_isolated(matrix, row, col)) { // Only proceed if it won't be isolated count_unholy_matrices(matrix, row, col + 1, count); } } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize the 8x8 matrix int count = 0; count_unholy_matrices(matrix, 0, 0, &count); printf("Total number of unholy 8x8 matrices: %d\n", count); return 0; } |
Timeout: function took too long to complete
Testing if the previous output contains the string 1121231537486377866
: False
A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
To solve the problem of counting the total number of unholy 8x8 binary matrices, we need to define the properties of such matrices. An 'unholy' matrix is one where there are no isolated '1's. An isolated '1' is defined as a '1' that has no adjacent '1's in the four cardinal directions (up, down, left, right). Here's a C program that systematically checks all possible 8x8 binary matrices and counts how many of them are 'unholy'.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | #include <stdio.h> #define SIZE 8 // Function to check if a given matrix is unholy int is_unholy(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1) { // Check if the 1 at (i, j) has any adjacent 1s int has_adjacent_one = 0; if (i > 0 && matrix[i - 1][j] == 1) has_adjacent_one = 1; // Up if (i < SIZE - 1 && matrix[i + 1][j] == 1) has_adjacent_one = 1; // Down if (j > 0 && matrix[i][j - 1] == 1) has_adjacent_one = 1; // Left if (j < SIZE - 1 && matrix[i][j + 1] == 1) has_adjacent_one = 1; // Right // If no adjacent 1 found, it's isolated if (!has_adjacent_one) { return 0; // It's not unholy } } } } return 1; // It's unholy } // Function to count unholy matrices long long count_unholy_matrices() { long long count = 0; int matrix[SIZE][SIZE]; // Iterate through all possible combinations of 0 and 1 in the matrix for (int i = 0; i < (1 << (SIZE * SIZE)); i++) { // Fill the matrix based on the bits of i for (int j = 0; j < SIZE; j++) { for (int k = 0; k < SIZE; k++) { matrix[j][k] = (i >> (j * SIZE + k)) & 1; } } // Check if the current matrix is unholy if (is_unholy(matrix)) { count++; } } return count; } int main() { long long total_unholy_matrices = count_unholy_matrices(); printf("Total number of unholy 8x8 matrices: %lld\n", total_unholy_matrices); return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | #include <stdio.h> #define SIZE 8 // Function to check if a given matrix is unholy int is_unholy(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1) { // Check if the 1 at (i, j) has any adjacent 1s int has_adjacent_one = 0; if (i > 0 && matrix[i - 1][j] == 1) has_adjacent_one = 1; // Up if (i < SIZE - 1 && matrix[i + 1][j] == 1) has_adjacent_one = 1; // Down if (j > 0 && matrix[i][j - 1] == 1) has_adjacent_one = 1; // Left if (j < SIZE - 1 && matrix[i][j + 1] == 1) has_adjacent_one = 1; // Right // If no adjacent 1 found, it's isolated if (!has_adjacent_one) { return 0; // It's not unholy } } } } return 1; // It's unholy } // Function to count unholy matrices long long count_unholy_matrices() { long long count = 0; int matrix[SIZE][SIZE]; // Iterate through all possible combinations of 0 and 1 in the matrix for (int i = 0; i < (1 << (SIZE * SIZE)); i++) { // Fill the matrix based on the bits of i for (int j = 0; j < SIZE; j++) { for (int k = 0; k < SIZE; k++) { matrix[j][k] = (i >> (j * SIZE + k)) & 1; } } // Check if the current matrix is unholy if (is_unholy(matrix)) { count++; } } return count; } int main() { long long total_unholy_matrices = count_unholy_matrices(); printf("Total number of unholy 8x8 matrices: %lld\n", total_unholy_matrices); return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | #include <stdio.h> #define SIZE 8 // Function to check if a given matrix is unholy int is_unholy(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1) { // Check if the 1 at (i, j) has any adjacent 1s int has_adjacent_one = 0; if (i > 0 && matrix[i - 1][j] == 1) has_adjacent_one = 1; // Up if (i < SIZE - 1 && matrix[i + 1][j] == 1) has_adjacent_one = 1; // Down if (j > 0 && matrix[i][j - 1] == 1) has_adjacent_one = 1; // Left if (j < SIZE - 1 && matrix[i][j + 1] == 1) has_adjacent_one = 1; // Right // If no adjacent 1 found, it's isolated if (!has_adjacent_one) { return 0; // It's not unholy } } } } return 1; // It's unholy } // Function to count unholy matrices long long count_unholy_matrices() { long long count = 0; int matrix[SIZE][SIZE]; // Iterate through all possible combinations of 0 and 1 in the matrix for (int i = 0; i < (1 << (SIZE * SIZE)); i++) { // Fill the matrix based on the bits of i for (int j = 0; j < SIZE; j++) { for (int k = 0; k < SIZE; k++) { matrix[j][k] = (i >> (j * SIZE + k)) & 1; } } // Check if the current matrix is unholy if (is_unholy(matrix)) { count++; } } return count; } int main() { long long total_unholy_matrices = count_unholy_matrices(); printf("Total number of unholy 8x8 matrices: %lld\n", total_unholy_matrices); return 0; } |
Total number of unholy 8x8 matrices: 0
main.c: In function 'count_unholy_matrices':
main.c:34:28: warning: left shift count >= width of type [-Wshift-count-overflow]
34 | for (int i = 0; i < (1 << (SIZE * SIZE)); i++) {
| ^~
Testing if the previous output contains the string 1121231537486377866
: False
A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
To count the total number of 'unholy' 8x8 binary matrices, we need to look at all possible 8x8 matrices and check if each matrix meets the criteria of having no isolated 1s. An isolated 1 is defined as a 1 that does not have another 1 in any of its cardinal directions (up, down, left, right). Here's a C program that generates all possible 8x8 binary matrices, checks for the 'unholy' condition, and counts those matrices.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #include <stdio.h> #define SIZE 8 int is_unholy(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1) { // Check the four cardinal directions int isolated = 1; if (i > 0 && matrix[i - 1][j] == 1) isolated = 0; // up if (i < SIZE - 1 && matrix[i + 1][j] == 1) isolated = 0; // down if (j > 0 && matrix[i][j - 1] == 1) isolated = 0; // left if (j < SIZE - 1 && matrix[i][j + 1] == 1) isolated = 0; // right if (isolated) { return 0; // Found an isolated 1 } } } } return 1; // No isolated 1s found } void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { // Check if the current matrix is unholy if (is_unholy(matrix)) { (*count)++; } return; } // Move to the next column int next_row = (col + 1 == SIZE) ? row + 1 : row; int next_col = (col + 1) % SIZE; // Try placing 0 in this cell matrix[row][col] = 0; count_unholy_matrices(matrix, next_row, next_col, count); // Try placing 1 in this cell matrix[row][col] = 1; count_unholy_matrices(matrix, next_row, next_col, count); } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize the matrix with zeros int count = 0; count_unholy_matrices(matrix, 0, 0, &count); printf("Total number of unholy 8x8 matrices: %d\n", count); return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #include <stdio.h> #define SIZE 8 int is_unholy(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1) { // Check the four cardinal directions int isolated = 1; if (i > 0 && matrix[i - 1][j] == 1) isolated = 0; // up if (i < SIZE - 1 && matrix[i + 1][j] == 1) isolated = 0; // down if (j > 0 && matrix[i][j - 1] == 1) isolated = 0; // left if (j < SIZE - 1 && matrix[i][j + 1] == 1) isolated = 0; // right if (isolated) { return 0; // Found an isolated 1 } } } } return 1; // No isolated 1s found } void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { // Check if the current matrix is unholy if (is_unholy(matrix)) { (*count)++; } return; } // Move to the next column int next_row = (col + 1 == SIZE) ? row + 1 : row; int next_col = (col + 1) % SIZE; // Try placing 0 in this cell matrix[row][col] = 0; count_unholy_matrices(matrix, next_row, next_col, count); // Try placing 1 in this cell matrix[row][col] = 1; count_unholy_matrices(matrix, next_row, next_col, count); } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize the matrix with zeros int count = 0; count_unholy_matrices(matrix, 0, 0, &count); printf("Total number of unholy 8x8 matrices: %d\n", count); return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #include <stdio.h> #define SIZE 8 int is_unholy(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1) { // Check the four cardinal directions int isolated = 1; if (i > 0 && matrix[i - 1][j] == 1) isolated = 0; // up if (i < SIZE - 1 && matrix[i + 1][j] == 1) isolated = 0; // down if (j > 0 && matrix[i][j - 1] == 1) isolated = 0; // left if (j < SIZE - 1 && matrix[i][j + 1] == 1) isolated = 0; // right if (isolated) { return 0; // Found an isolated 1 } } } } return 1; // No isolated 1s found } void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { // Check if the current matrix is unholy if (is_unholy(matrix)) { (*count)++; } return; } // Move to the next column int next_row = (col + 1 == SIZE) ? row + 1 : row; int next_col = (col + 1) % SIZE; // Try placing 0 in this cell matrix[row][col] = 0; count_unholy_matrices(matrix, next_row, next_col, count); // Try placing 1 in this cell matrix[row][col] = 1; count_unholy_matrices(matrix, next_row, next_col, count); } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize the matrix with zeros int count = 0; count_unholy_matrices(matrix, 0, 0, &count); printf("Total number of unholy 8x8 matrices: %d\n", count); return 0; } |
Timeout: function took too long to complete
Testing if the previous output contains the string 1121231537486377866
: False
A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
A binary 8x8 matrix is 'unholy' if there are no isolated 1s. A 1 is isolated if there isn't another 1 in any of the 4 direct cardinal directions. Write a C program that counts the total number of unholy 8x8 matricies.
To solve the problem of counting the total number of 'unholy' 8x8 binary matrices (where 'unholy' means that there are no isolated 1s), we can write a C program that generates all possible 8x8 matrices and checks each one for the 'unholy' condition. Here is a C program that accomplishes this:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | #include <stdio.h> #define SIZE 8 // Function to check if a matrix is unholy int is_unholy(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1) { // Check if the 1 is isolated if ((i > 0 && matrix[i-1][j] == 1) || // Check above (i < SIZE-1 && matrix[i+1][j] == 1) || // Check below (j > 0 && matrix[i][j-1] == 1) || // Check left (j < SIZE-1 && matrix[i][j+1] == 1)) { // Check right continue; // Not isolated } else { return 0; // Isolated 1 found } } } } return 1; // No isolated 1s found, matrix is unholy } // Function to generate all binary matrices and count unholy ones void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { if (is_unholy(matrix)) { (*count)++; } return; } // Move to next column int next_row = (col == SIZE - 1) ? row + 1 : row; int next_col = (col + 1) % SIZE; // Set current cell to 0 and recurse matrix[row][col] = 0; count_unholy_matrices(matrix, next_row, next_col, count); // Set current cell to 1 and recurse matrix[row][col] = 1; count_unholy_matrices(matrix, next_row, next_col, count); } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize the matrix to 0 int unholy_count = 0; count_unholy_matrices(matrix, 0, 0, &unholy_count); printf("Total number of unholy 8x8 matrices: %d\n", unholy_count); return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | #include <stdio.h> #define SIZE 8 // Function to check if a matrix is unholy int is_unholy(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1) { // Check if the 1 is isolated if ((i > 0 && matrix[i-1][j] == 1) || // Check above (i < SIZE-1 && matrix[i+1][j] == 1) || // Check below (j > 0 && matrix[i][j-1] == 1) || // Check left (j < SIZE-1 && matrix[i][j+1] == 1)) { // Check right continue; // Not isolated } else { return 0; // Isolated 1 found } } } } return 1; // No isolated 1s found, matrix is unholy } // Function to generate all binary matrices and count unholy ones void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { if (is_unholy(matrix)) { (*count)++; } return; } // Move to next column int next_row = (col == SIZE - 1) ? row + 1 : row; int next_col = (col + 1) % SIZE; // Set current cell to 0 and recurse matrix[row][col] = 0; count_unholy_matrices(matrix, next_row, next_col, count); // Set current cell to 1 and recurse matrix[row][col] = 1; count_unholy_matrices(matrix, next_row, next_col, count); } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize the matrix to 0 int unholy_count = 0; count_unholy_matrices(matrix, 0, 0, &unholy_count); printf("Total number of unholy 8x8 matrices: %d\n", unholy_count); return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | #include <stdio.h> #define SIZE 8 // Function to check if a matrix is unholy int is_unholy(int matrix[SIZE][SIZE]) { for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { if (matrix[i][j] == 1) { // Check if the 1 is isolated if ((i > 0 && matrix[i-1][j] == 1) || // Check above (i < SIZE-1 && matrix[i+1][j] == 1) || // Check below (j > 0 && matrix[i][j-1] == 1) || // Check left (j < SIZE-1 && matrix[i][j+1] == 1)) { // Check right continue; // Not isolated } else { return 0; // Isolated 1 found } } } } return 1; // No isolated 1s found, matrix is unholy } // Function to generate all binary matrices and count unholy ones void count_unholy_matrices(int matrix[SIZE][SIZE], int row, int col, int *count) { if (row == SIZE) { if (is_unholy(matrix)) { (*count)++; } return; } // Move to next column int next_row = (col == SIZE - 1) ? row + 1 : row; int next_col = (col + 1) % SIZE; // Set current cell to 0 and recurse matrix[row][col] = 0; count_unholy_matrices(matrix, next_row, next_col, count); // Set current cell to 1 and recurse matrix[row][col] = 1; count_unholy_matrices(matrix, next_row, next_col, count); } int main() { int matrix[SIZE][SIZE] = {0}; // Initialize the matrix to 0 int unholy_count = 0; count_unholy_matrices(matrix, 0, 0, &unholy_count); printf("Total number of unholy 8x8 matrices: %d\n", unholy_count); return 0; } |
Timeout: function took too long to complete
Testing if the previous output contains the string 1121231537486377866
: False