Files
advent-of-code/2020/templates/ex2-c.c

61 lines
1.2 KiB
C

/* ex1-c: Advent2020 game, day 3/game 2
*/
#include <stdio.h>
#include <stdlib.h>
struct {
int dx;
int dy;
int pos;
int count;
} set[] = {
{ 1, 1, 0, 0},
{ 3, 1, 0, 0},
{ 5, 1, 0, 0},
{ 7, 1, 0, 0},
{ 1, 2, 0, 0},
{-1, -1, 0, 0} /* end marker - not necessary */
};
int my_strlen(str)
char *str;
{
int i;
for (i=0; *str; ++i, ++str)
;
return i;
}
int main(ac, av)
int ac;
char **av;
{
int line=0, linelen=0, mod=0, i;
unsigned long res=1;
char str[80];
scanf("%s", str); /* ignore 1st line */
while (scanf("%s", str) != EOF) {
line++;
linelen=my_strlen(str);
for (i=0; set[i].dx >= 0; ++i) {
if (! (line % set[i].dy )) { /* line ok for this set */
set[i].pos += set[i].dx; /* increment set column */
mod = set[i].pos % linelen;
if ( str[mod] == '#')
set[i].count++;
}
}
}
printf("%s : ", *av);
for (i=0; set[i].dx != -1; ++i) {
printf("[%d]=[%d, %d, %d, %d] ", i,
set[i].dx, set[i].dy, set[i].pos, set[i].count);
res*=set[i].count;
}
printf ("res:%lu\n", res);
exit (0);
}