advent2025

commit f78d33ff0b0e7c65e87e204c6b0b4f66cd69da5d
parent 1580b3c4c755f07896b0ef742b72d5a6f11ab539
Author: bsandro <email@bsandro.tech>
Date:   Tue,  2 Dec 2025 09:11:31 +0200

day02 cleanup

Diffstat:
M
cputime.h
 | 
4
++--
M
day02.c
 | 
9
++++-----

2 files changed, 6 insertions(+), 7 deletions(-)
diff --git a/cputime.h b/cputime.h
@@ -4,12 +4,12 @@ static volatile unsigned long long now = 0;
 
 void __attribute((constructor)) begin() {
     struct timespec ts;
-    clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+    clock_gettime(CLOCK_MONOTONIC, &ts);
     now = ts.tv_sec + ts.tv_nsec;
 }
 
 void __attribute((destructor)) end() {
     struct timespec ts;
-    clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+    clock_gettime(CLOCK_MONOTONIC, &ts);
     printf("%f s\n", (double)((ts.tv_sec+ts.tv_nsec)-now)/1e9);
 }
diff --git a/day02.c b/day02.c
@@ -19,13 +19,13 @@ inline uint64_t btoi(uint64_t buf[32], int bufs) {
     return num;
 }
 
-inline void itoa(uint64_t num, char str[32]) { //unused
+inline void itoa(uint64_t num, char str[32]) {
     int d = digits(num);
-    for (int i=0;i<d;++i) {
+    for (int i=d-1;i>=0;--i) {
         str[i] = num%10+'0';
+        num = num/10;
     }
     str[d] = '\0';
-    printf("itoa %lu -> %s\n", num, str);
 }
 
 inline bool is_silly1(uint64_t num) {
@@ -42,7 +42,7 @@ inline bool is_silly1(uint64_t num) {
 inline bool is_silly2(uint64_t num) {
     int d = digits(num);
     char s[32] = {0};
-    snprintf(s, 31, "%lu", num); // gave up on atoi for now
+    itoa(num, s);
     for (int i=1;i<=d/2;++i) { // checking pattern 0-i
         int rep = 0;
         for (int j=0;j<d;j+=i) {
@@ -76,7 +76,6 @@ int main(void) {
         } else if (c==','||c=='\n') {
             range.last = btoi(buf, bufs);
             bufs = 0;
-            //printf("%"PRIu64"->%"PRIu64"\n", range.first, range.last);
             p1 += sum_silly(range, is_silly1);
             p2 += sum_silly(range, is_silly2);
         }