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