From e0c2037ee5cede636e907e8af462371ee0e775db Mon Sep 17 00:00:00 2001 From: Adam Spragg Date: Sun, 4 Dec 2022 16:47:21 +0000 Subject: Advent of code 2022 problems 1-4 --- 4b.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 4b.c (limited to '4b.c') diff --git a/4b.c b/4b.c new file mode 100644 index 0000000..6f43c21 --- /dev/null +++ b/4b.c @@ -0,0 +1,51 @@ + +#include +#include + + +char * +getsect(int * dest, char * pch, char expect) +{ + char * end; + + if (!pch) + return NULL; + *dest = strtol(pch, &end, 10); + if (*dest == 0 && end == pch) + return NULL; + if (*end != expect) + return NULL; + if (expect) + ++end; + return end; +} + + +int +main() +{ + char buf[BUFSIZ]; + int overlaps = 0; + + while (fgets(buf, sizeof(buf), stdin)) { + int n[4]; + char * pbuf; + + pbuf = getsect(&n[0], buf, '-'); + pbuf = getsect(&n[1], pbuf, ','); + pbuf = getsect(&n[2], pbuf, '-'); + pbuf = getsect(&n[3], pbuf, '\n'); + if (!pbuf) { + fprintf(stderr, "Unexpected line: %s\n", buf); + return -1; + } + if (!(n[3] < n[0] || n[2] > n[1])) { + ++overlaps; + } + } + + printf("Overlaps: %d\n", overlaps); + + return 0; +} + -- cgit v1.2.1