63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define BUFFER_SIZE 64
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#define INTERESTING_CYCLES 20, 60, 100, 140, 180, 220
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#define CRT_WIDTH 40
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#define CRT_HEIGHT 6
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int main() {
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char buf[BUFFER_SIZE], *p, c;
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memset(buf, 0, BUFFER_SIZE);
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p = buf;
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int X = 1, cycle = 0, sum = 0, add, delay = 0;
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int interesting_cycles[] = {INTERESTING_CYCLES};
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int row =0, col = 0;
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while ((c = getchar()) != EOF) {
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*p++ = c;
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if (c == '\n') {
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if (sscanf(buf, "addx %i", &add)) {
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delay = 2;
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} else {
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add = 0;
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delay = 1;
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}
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while (delay > 0) {
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cycle++;
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if (col == CRT_WIDTH) {
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printf("\n");
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col = 0;
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row++;
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}
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if (X - 1 == col || X == col || X + 1 == col) {
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printf("#");
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} else {
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printf(".");
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}
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// Update sum if we are in the right cycle
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for (int i = 0; i < sizeof(interesting_cycles)/sizeof(int); i++) {
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if (interesting_cycles[i] == cycle) {
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sum += X * cycle;
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}
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}
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col++;
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delay--;
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}
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X += add;
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memset(buf, 0, BUFFER_SIZE);
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p = buf;
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}
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}
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printf("\n%i\n", sum);
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}
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