diff options
| -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); +} |