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day 12 part two wrong, day 13 done
[advent21.git]
/
06a.c
diff --git
a/06a.c
b/06a.c
index
92a1b8a
..
e2634d2
100644
(file)
--- a/
06a.c
+++ b/
06a.c
@@
-4,31
+4,20
@@
int main()
{
int main()
{
- char buf[1000];
- if (fgets(buf, 1000, stdin) == NULL)
- return 1;
- long fish0[9] = {0};
- long fish1[9] = {0};
- long *this = &fish0[0];
- long *that = &fish1[0];
+ char *buf = NULL;
+ size_t len = 0;
+ long fish[9] = {0};
+ getline(&buf, &len, stdin);
char *p = strtok(buf, ",");
char *p = strtok(buf, ",");
-
this
[atoi(p)]++;
+
fish
[atoi(p)]++;
while ((p = strtok(NULL, ",")) != NULL)
while ((p = strtok(NULL, ",")) != NULL)
-
this
[atoi(p)]++;
+
fish
[atoi(p)]++;
- for (long day = 0; day<80; day++) {
- that[8] = this[0];
- for (long i = 0; i<8; i++)
- that[i] = this[i+1];
- that[6] += this[0];
- long *tmp = this;
- this = that;
- that = tmp;
- }
+ for (long day = 0; day<80; day++)
+ fish[(day+7) % 9] += fish[day%9];
- long sum = 0;
- for (long i = 0; i<=8; i++)
- sum += this[i];
- printf("%lu\n", sum);
+ for (long i = 1; i<=8; i++)
+ fish[0] += fish[i];
+ printf("%ld\n", fish[0]);
}
}