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| author | June McEnroe <june@causal.agency> | 2019-12-04 01:45:21 -0500 |
|---|---|---|
| committer | June McEnroe <june@causal.agency> | 2020-11-22 00:14:26 -0500 |
| commit | 1ed2a868560b7ef38c1de4d845b96197dcface0f (patch) | |
| tree | 4d8581991913b53420ed2a6499035335cd013a62 /2019 | |
| parent | Solve day 3 part 2 (diff) | |
| download | aoc-1ed2a868560b7ef38c1de4d845b96197dcface0f.tar.gz aoc-1ed2a868560b7ef38c1de4d845b96197dcface0f.zip | |
Solve day 4 part 1
Diffstat (limited to '2019')
| -rw-r--r-- | 2019/day04.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/2019/day04.c b/2019/day04.c new file mode 100644 index 0000000..3c31931 --- /dev/null +++ b/2019/day04.c @@ -0,0 +1,18 @@ +#include <stdio.h> +#include <stdlib.h> +int main(void) { + int min, max; + scanf("%d-%d", &min, &max); + int count = 0; + for (int n = min; n <= max; ++n) { + char str[7]; + snprintf(str, sizeof(str), "%d", n); + int adj = 0, dec = 0; + for (int i = 1; i < 6; ++i) { + if (str[i] == str[i - 1]) adj = 1; + if (str[i] < str[i - 1]) dec = 1; + } + if (adj && !dec) count++; + } + printf("%d\n", count); +} |