Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
This function counts the number of times a particular pattern remains unchanged after applying a specific rule to each cell in an 8x8 grid. To make the function shorter: 1. We can remove the unnecessary variable declarations for ROWS and COLS since they are not being used. 2. We can combine the initialization of `array` and `init` into a single line. 3. We can remove the inner loop that iterates through the grid and directly calculate the positions of the neighbors using bitwise operations. 4. We can simplify the update condition by combining the sum of neighbors check and the cell value check.
1 2 3 4 5 6 7 8 | int count() { int count = 0; for (int i = 0; i < 1 << 16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << 5) | ((i & 0xf00) >> 1) | ((i & 0xf000) >> 5); count += (array == ((array & 0x8181818181818181ULL) & ~(array & (array << 1) & (array >> 1) & (array << 8) & (array >> 8)))); } return count; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 | int count() { int count = 0; for (int i = 0; i < 1 << 16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << 5) | ((i & 0xf00) >> 1) | ((i & 0xf000) >> 5); count += (array == ((array & 0x8181818181818181ULL) & ~(array & (array << 1) & (array >> 1) & (array << 8) & (array >> 8)))); } return count; } |
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 | int count() { int count = 0; for (int i = 0; i < 1 << 16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << 5) | ((i & 0xf00) >> 1) | ((i & 0xf000) >> 5); count += (array == ((array & 0x8181818181818181ULL) & ~(array & (array << 1) & (array >> 1) & (array << 8) & (array >> 8)))); } return count; } #include<stdio.h> #include<stdlib.h> int main() { int answer = count(); int expected = 27488; if (answer != expected) { printf("Wrong answer; got %d instead of %d.\n", answer, expected); exit(1); } printf("All tests passed\n"); } |
Wrong answer; got 16 instead of 27488.
Testing if the previous output contains the string All tests passed
: False
Resulting in output: True
Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
This function counts the number of times a specific cellular automaton rule results in a stable state, where no cells change after one iteration. 1. The function iterates through all possible initial configurations of the cellular automaton, applies the rule, and checks if the resulting configuration is the same as the initial one. 2. To make the function shorter, we can: - Remove unnecessary variable declarations and initializations. - Combine the nested loops into a single loop. - Simplify the bitwise operations for updating the cell values. 3. Shortened function:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | int count() { int ROWS = 8, COLS = 8, count = 0; for (int i = 0; i < 1 << 16; i++) { long long unsigned int array = i << 9; long long unsigned int temp = array; for (int j = 0; j < 48; j++) { int pos = 9 + j; int sum = ((temp >> (pos - 1)) & 1) + ((temp >> (pos - 8)) & 1) + ((temp >> (pos + 1)) & 1) + ((temp >> (pos + 8)) & 1); if (sum == 0 && ((temp >> pos) & 1)) { array &= ~(1ULL << pos); } } count += (array == i << 9); } return count; } |
1 | int count(){int ROWS=8,COLS=8,count=0;for(int i=0;i<1<<16;i++){long long unsigned int array=i<<9,temp=array;for(int j=0;j<48;j++){int pos=9+j,sum=((temp>>(pos-1))&1)+((temp>>(pos-8))&1)+((temp>>(pos+1))&1)+((temp>>(pos+8))&1);if(sum==0&&((temp>>pos)&1)){array&=~(1ULL<<pos);}}count+=(array==i<<9);}return count;} |
I extracted the following code from that output:
1 | int count(){int ROWS=8,COLS=8,count=0;for(int i=0;i<1<<16;i++){long long unsigned int array=i<<9,temp=array;for(int j=0;j<48;j++){int pos=9+j,sum=((temp>>(pos-1))&1)+((temp>>(pos-8))&1)+((temp>>(pos+1))&1)+((temp>>(pos+8))&1);if(sum==0&&((temp>>pos)&1)){array&=~(1ULL<<pos);}}count+=(array==i<<9);}return count;} |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | int count(){int ROWS=8,COLS=8,count=0;for(int i=0;i<1<<16;i++){long long unsigned int array=i<<9,temp=array;for(int j=0;j<48;j++){int pos=9+j,sum=((temp>>(pos-1))&1)+((temp>>(pos-8))&1)+((temp>>(pos+1))&1)+((temp>>(pos+8))&1);if(sum==0&&((temp>>pos)&1)){array&=~(1ULL<<pos);}}count+=(array==i<<9);}return count;} #include<stdio.h> #include<stdlib.h> int main() { int answer = count(); int expected = 27488; if (answer != expected) { printf("Wrong answer; got %d instead of %d.\n", answer, expected); exit(1); } printf("All tests passed\n"); } |
Wrong answer; got 24273 instead of 27488.
Testing if the previous output contains the string All tests passed
: False
Resulting in output: False
Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
1. The function `count` iterates through all possible 8x8 grids, where each cell can be either alive (1) or dead (0) based on the rules of Conway's Game of Life. It counts the number of grids where the grid remains the same after one iteration. 2. Ways to make the function shorter: - Combine the calculation of bit positions and neighbor values into a single expression - Use bitwise operations to simplify cell update condition 3. Shortened `count` function:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | int count() { int ROWS = 8, COLS = 8, count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << 5) | ((i & 0xf00) << 1) | ((i & 0xf000) >> 3); long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) for (int j = 1; j < COLS - 1; j++) { int pos = i * COLS + j, sum = __builtin_popcount((temp >> (pos - COLS - 1)) & 0x1FF); if (sum == 0 && (temp >> pos) & 1) array &= ~(1ULL << pos); } count += (array == temp); } return count; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | int count() { int ROWS = 8, COLS = 8, count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << 5) | ((i & 0xf00) << 1) | ((i & 0xf000) >> 3); long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) for (int j = 1; j < COLS - 1; j++) { int pos = i * COLS + j, sum = __builtin_popcount((temp >> (pos - COLS - 1)) & 0x1FF); if (sum == 0 && (temp >> pos) & 1) array &= ~(1ULL << pos); } count += (array == temp); } return count; } |
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 | int count() { int ROWS = 8, COLS = 8, count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << 5) | ((i & 0xf00) << 1) | ((i & 0xf000) >> 3); long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) for (int j = 1; j < COLS - 1; j++) { int pos = i * COLS + j, sum = __builtin_popcount((temp >> (pos - COLS - 1)) & 0x1FF); if (sum == 0 && (temp >> pos) & 1) array &= ~(1ULL << pos); } count += (array == temp); } return count; } #include<stdio.h> #include<stdlib.h> int main() { int answer = count(); int expected = 27488; if (answer != expected) { printf("Wrong answer; got %d instead of %d.\n", answer, expected); exit(1); } printf("All tests passed\n"); } |
Wrong answer; got 1 instead of 27488.
Testing if the previous output contains the string All tests passed
: False
Resulting in output: False
Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
1. This function counts the number of times a specific cellular automaton configuration reaches a stable state after applying a set of rules. 2. Some ways to make this function shorter: - Remove unnecessary variable declarations and initializations. - Combine the bit manipulation operations into a single expression. - Simplify the inner loop by removing unnecessary calculations and conditions. 3. The shorter version of the function:
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 | int count() { int count = 0; for (int i = 0; i < 1<<16; i++) { unsigned long long array = ((i & 0xf) << 9) | ((i & 0xf0) << 13) | ((i & 0xf00) << 17) | ((i & 0xf000) << 21); unsigned long long init = array; unsigned long long temp = array; for (int i = 9; i < 64; i++) { int pos = i; int topPos = i - 8; int leftPos = i - 1; int bottomPos = i + 8; int rightPos = i + 1; int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; int sum = top + left + bottom + right; if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } count += (init == array); } return count; } |
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 | int count() { int count = 0; for (int i = 0; i < 1<<16; i++) { unsigned long long array = ((i & 0xf) << 9) | ((i & 0xf0) << 13) | ((i & 0xf00) << 17) | ((i & 0xf000) << 21); unsigned long long init = array; unsigned long long temp = array; for (int i = 9; i < 64; i++) { int pos = i; int topPos = i - 8; int leftPos = i - 1; int bottomPos = i + 8; int rightPos = i + 1; int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; int sum = top + left + bottom + right; if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } count += (init == array); } return count; } |
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 | int count() { int count = 0; for (int i = 0; i < 1<<16; i++) { unsigned long long array = ((i & 0xf) << 9) | ((i & 0xf0) << 13) | ((i & 0xf00) << 17) | ((i & 0xf000) << 21); unsigned long long init = array; unsigned long long temp = array; for (int i = 9; i < 64; i++) { int pos = i; int topPos = i - 8; int leftPos = i - 1; int bottomPos = i + 8; int rightPos = i + 1; int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; int sum = top + left + bottom + right; if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } count += (init == array); } return count; } #include<stdio.h> #include<stdlib.h> int main() { int answer = count(); int expected = 27488; if (answer != expected) { printf("Wrong answer; got %d instead of %d.\n", answer, expected); exit(1); } printf("All tests passed\n"); } |
All tests passed
Testing if the previous output contains the string All tests passed
: True
Resulting in output: False
Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
Code golf this function to be a lot shorter. You only get points if it's <300 bytes (not counting whitespace). Keep the function named `count`.
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 | int count() { int ROWS = 8; int COLS = 8; int count = 0; for (int i = 0; i < 1<<16; i++) { long long unsigned int array = ((i & 0xf) << 9) | ((i & 0xf0) << (9 + 8 - 4)) | ((i & 0xf00) << (9 + 8 - 4 + 8 - 4)) | ((i & 0xf000) << (9 + 8 - 4 + 8 - 4 + 8 - 4)); long long unsigned int init = array; long long unsigned int temp = array; for (int i = 1; i < ROWS - 1; i++) { for (int j = 1; j < COLS - 1; j++) { // Calculate bit positions int pos = i * COLS + j; int topPos = (i - 1) * COLS + j; int leftPos = i * COLS + (j - 1); int bottomPos = (i + 1) * COLS + j; int rightPos = i * COLS + (j + 1); // Get the values of the neighbors int cell = (temp >> pos) & 1; int top = (temp >> topPos) & 1; int left = (temp >> leftPos) & 1; int bottom = (temp >> bottomPos) & 1; int right = (temp >> rightPos) & 1; // Sum the values of the neighbors int sum = top + left + bottom + right; // Update the cell if all neighbors are 0 and the cell itself is 1 if (sum == 0 && cell == 1) { array &= ~(1ULL << pos); } } } count += (init == array); } return count; } |
This function counts the number of times a cellular automaton grid remains unchanged after applying a specific rule. 1. The function initializes a 8x8 grid and iterates through all possible configurations of the grid. For each configuration, it applies a rule to update the grid and checks if the grid remains unchanged after the rule is applied. 2. To make the function shorter, we can: - Remove unnecessary variable declarations. - Combine bitwise operations when calculating the updated grid. - Simplify the loop conditions and variable names. - Minimize unnecessary white spaces. 3. Here's the shortened function:
1 2 3 4 5 6 7 8 9 10 11 12 13 | int count() { int r=8,c=8,i,cnt=0; for(i=0;i<1<<16;i++){ long long unsigned a=((i&0xf)<<9)|((i&0xf0)<<(9+8-4))|((i&0xf00)<<(9+8-4+8-4))|((i&0xf000)<<(9+8-4+8-4+8-4)),t=a; for(int i=1;i<r-1;i++){ for(int j=1;j<c-1;j++){ int p=i*c+j,tp=(i-1)*c+j,lp=i*c+j-1,bp=(i+1)*c+j,rp=i*c+j+1,c=(t>>p)&1,t=(t&~(1ULL<<p))|((c&&(t>>tp)&(t>>lp)&(t>>bp)&(t>>rp))?0:(c<<p)); } } cnt+=(a==t); } return cnt; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 | int count() { int r=8,c=8,i,cnt=0; for(i=0;i<1<<16;i++){ long long unsigned a=((i&0xf)<<9)|((i&0xf0)<<(9+8-4))|((i&0xf00)<<(9+8-4+8-4))|((i&0xf000)<<(9+8-4+8-4+8-4)),t=a; for(int i=1;i<r-1;i++){ for(int j=1;j<c-1;j++){ int p=i*c+j,tp=(i-1)*c+j,lp=i*c+j-1,bp=(i+1)*c+j,rp=i*c+j+1,c=(t>>p)&1,t=(t&~(1ULL<<p))|((c&&(t>>tp)&(t>>lp)&(t>>bp)&(t>>rp))?0:(c<<p)); } } cnt+=(a==t); } return cnt; } |
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 | int count() { int r=8,c=8,i,cnt=0; for(i=0;i<1<<16;i++){ long long unsigned a=((i&0xf)<<9)|((i&0xf0)<<(9+8-4))|((i&0xf00)<<(9+8-4+8-4))|((i&0xf000)<<(9+8-4+8-4+8-4)),t=a; for(int i=1;i<r-1;i++){ for(int j=1;j<c-1;j++){ int p=i*c+j,tp=(i-1)*c+j,lp=i*c+j-1,bp=(i+1)*c+j,rp=i*c+j+1,c=(t>>p)&1,t=(t&~(1ULL<<p))|((c&&(t>>tp)&(t>>lp)&(t>>bp)&(t>>rp))?0:(c<<p)); } } cnt+=(a==t); } return cnt; } #include<stdio.h> #include<stdlib.h> int main() { int answer = count(); int expected = 27488; if (answer != expected) { printf("Wrong answer; got %d instead of %d.\n", answer, expected); exit(1); } printf("All tests passed\n"); } |
Wrong answer; got 65536 instead of 27488.
Testing if the previous output contains the string All tests passed
: False
Resulting in output: False