commit 12cad2011c8345dc17e8f5da903c3169611f3d83
parent e9d25d8ce8565f3cdccb91b8471c5d9f09fd5459
Author: bsandro <brian.drosan@gmail.com>
Date: Tue, 7 Dec 2021 11:51:41 +0200
Day 07, puzzle 1
Diffstat:
5 files changed, 165 insertions(+), 0 deletions(-)
diff --git a/day07/Makefile b/day07/Makefile
@@ -0,0 +1,26 @@
+NAME=$(shell basename ${PWD})
+CC=cc
+SRC=$(wildcard *.c)
+DEPS:=$(wildcard *.h)
+OBJ:=$(SRC:.c=.o)
+
+CFLAGS=-O2 -std=c99 -Werror -Wall -Wextra -I. -I../common
+
+all: $(NAME)
+
+.PHONY: clean run
+
+clean:
+ rm -f $(OBJ) $(NAME)
+
+%.o : %.c $(DEPS)
+ $(CC) $(CFLAGS) -c $< -o $@
+
+$(NAME): $(OBJ)
+ $(CC) $(OBJ) -o $@ $(LDFLAGS)
+
+run: $(NAME)
+ ./$(NAME) input.txt
+
+test: $(NAME)
+ ./$(NAME) test.txt
diff --git a/day07/input.txt b/day07/input.txt
@@ -0,0 +1 @@
+1101,1,29,67,1102,0,1,65,1008,65,35,66,1005,66,28,1,67,65,20,4,0,1001,65,1,65,1106,0,8,99,35,67,101,99,105,32,110,39,101,115,116,32,112,97,115,32,117,110,101,32,105,110,116,99,111,100,101,32,112,114,111,103,114,97,109,10,160,1267,277,1068,422,1235,790,1391,45,252,513,1029,414,216,409,1373,1419,1176,757,64,748,835,20,436,147,347,1264,1532,240,272,430,7,85,51,12,107,1277,779,867,260,802,361,89,754,206,80,25,559,220,657,178,186,2,31,825,290,144,379,0,1682,1166,1241,180,102,464,444,122,718,25,100,1050,1358,604,546,1157,130,59,127,1351,238,97,75,821,265,23,786,116,115,93,730,1340,777,1114,263,352,115,5,69,1041,101,1222,203,1273,217,28,976,425,480,7,124,45,192,860,312,1107,1040,137,306,523,692,590,562,789,383,145,86,297,791,240,697,22,230,834,963,837,1164,1758,487,414,86,1026,1034,478,613,1,769,85,980,935,1455,16,204,170,380,324,14,699,220,50,451,738,52,437,963,718,178,508,711,1739,936,1515,246,908,126,602,295,591,22,484,752,1,1442,167,132,52,613,1172,353,36,56,468,123,393,765,1456,218,269,6,20,649,727,454,86,640,1113,836,124,405,571,882,107,75,730,346,94,35,626,1174,299,392,1449,502,854,500,128,852,248,645,159,774,155,884,1336,285,426,0,269,466,1483,93,13,17,255,295,530,694,1178,968,612,224,160,32,1154,194,494,24,845,43,274,344,301,486,43,351,581,929,168,1629,163,206,98,1242,1242,1706,1777,721,293,1621,132,199,12,66,247,1244,333,445,154,795,70,424,11,826,835,250,288,408,516,822,411,69,636,521,152,67,401,531,186,933,515,780,490,201,369,111,266,952,400,677,372,548,1325,1111,17,543,1293,20,507,74,116,656,644,872,35,80,1273,279,475,1585,1446,651,1338,285,284,23,1130,237,843,121,53,81,573,5,956,276,553,1084,544,731,35,16,53,34,405,1337,665,303,10,108,1132,233,3,834,415,161,409,1055,202,707,296,341,57,521,548,15,137,359,57,388,282,267,293,1450,28,424,819,941,1388,474,687,87,271,1462,522,33,26,841,345,104,150,573,481,297,1075,489,420,424,340,504,685,105,898,870,206,129,516,492,42,216,1829,1317,10,60,54,255,103,457,257,101,93,981,412,67,519,574,169,799,381,1509,60,409,51,151,464,1676,916,18,30,772,1566,1283,359,1260,10,405,750,160,181,541,358,213,300,1073,328,399,214,119,478,889,65,56,1077,1427,52,359,90,42,1248,336,51,1396,509,237,785,440,806,339,99,354,640,272,665,772,135,91,11,175,128,482,1244,1243,629,137,140,1003,626,433,391,731,1180,671,169,710,1561,385,1281,272,236,318,207,1323,16,233,9,720,295,34,183,362,987,1016,366,760,1244,878,600,275,1209,41,792,951,85,636,125,217,342,184,581,1300,66,165,804,285,756,96,278,598,163,655,138,869,537,141,1364,897,406,617,65,444,244,494,172,119,358,1183,310,226,98,550,634,948,985,247,1499,729,165,371,939,299,761,477,1480,840,3,319,675,492,564,3,3,80,182,69,460,341,789,742,46,1309,360,48,296,363,946,214,252,54,147,435,85,276,1072,23,71,755,572,268,1362,619,639,365,623,1560,322,535,997,1021,317,663,82,314,857,16,194,363,24,240,1596,1123,242,816,116,645,64,38,589,428,147,632,457,555,908,921,202,182,403,551,358,483,1195,1213,28,1156,725,320,16,74,931,103,145,146,1206,433,1052,158,531,699,675,379,393,475,384,1041,141,1248,521,136,326,199,725,200,465,796,724,672,569,70,663,15,150,131,1261,17,1211,66,175,608,17,81,551,627,1469,1032,342,2,972,184,798,960,22,55,462,1,151,91,119,76,1062,96,1424,567,366,831,633,205,691,50,1314,732,558,167,1624,5,147,47,110,250,935,177,445,79,306,653,47,75,626,173,104,354,573,523,46,46,757,541,431,1129,787,502,1328,1093,82,872,1876,1386,136,504,273,194,297,0,163,1025,996,354,1457,1127,52,45,1364,1128,457,1576,282,573,1648,16,28,582,768,92,92,817,1515,297,349,97,1523,634,923,76,1174,552,347,750,326,221,149,0,188,791,251,113,1,71,92,393,103,618,335,97,236,418,256,764,435,411,941,74,423,443,27,427,178,262,181,362,156,572,324,684,796,249,288,413,132,29,444,766,1135,1235,208,231,620,1481,228,174,133,918,1825,618,663,22,124,119,52,159,1318,1724,338,243,206,127,436,163,297,617,141,59,65,20,164,11,126,363,150,726,217,1282,1708,118,1055,60,603,852,170,1097,58,213,495,566,673,1607,994,539,1655
diff --git a/day07/main.c b/day07/main.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <time.h>
+
+void puzzle(const char *filename, size_t *res1, size_t *res2);
+
+int main(int argc, char *argv[]) {
+ printf("Advent of Code: day 07\n");
+ double time_start = clock();
+
+ if (argc <= 0) {
+ return -1;
+ }
+ if (argc <= 1) {
+ printf("Usage: %s inputfile.txt\n", argv[0]);
+ return -1;
+ }
+
+ const char *filename = argv[1];
+
+ size_t counter1 = 0;
+ size_t counter2 = 0;
+
+ puzzle(filename, &counter1, &counter2);
+
+ printf("Puzzle #1: %zu\n", counter1);
+ printf("Puzzle #2: %zu\n", counter2);
+
+ double elapsed = clock() - time_start;
+ printf("Elapsed: %f\n", elapsed / CLOCKS_PER_SEC);
+
+ return 0;
+}
diff --git a/day07/puzzle.c b/day07/puzzle.c
@@ -0,0 +1,105 @@
+#define _DEFAULT_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <strings.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <time.h>
+
+#include "util.h"
+
+#define STR_LEN 16384
+
+void make_numbers_array(struct array_t *numbers, const char *str);
+
+void qs_swap(int *a, int *b);
+long long qs_partition(int *numbers, long long low, long long high);
+void qs(int *numbers, long long low, long long high);
+
+/* ****************************************************************** */
+
+void puzzle(const char *filename, size_t *result1, size_t *result2) {
+ FILE *infile = fopen(filename, "r");
+ if (infile == NULL) {
+ fprintf(stderr, "fopen() error: %s\n", strerror(errno));
+ return;
+ }
+
+ char buf[STR_LEN] = {0};
+ unsigned int line_num = 0;
+
+ struct array_t numbers = { .data = NULL };
+ array_init(&numbers, sizeof(int), 100);
+
+ while (fgets(buf, STR_LEN, infile) != NULL) {
+ make_numbers_array(&numbers, buf);
+ ++line_num;
+ bzero(buf, STR_LEN);
+ }
+
+ qs((int *)numbers.data, 0, numbers.count - 1);
+
+ size_t index = numbers.count / 2;
+ int *data = (int *)numbers.data;
+ int mid = data[index];
+ for (size_t i = 0; i < numbers.count; ++i) {
+ *result1 += abs(data[i] - mid);
+ }
+
+ *result2 = 0;
+
+ // mutiny! ignoring feof/ferror.
+ free(numbers.data);
+ fclose(infile);
+}
+
+/* ************************* BOILERPLATE ************************* */
+
+void make_numbers_array(struct array_t *numbers, const char *str) {
+ char *tmp = strndup(str, STR_LEN);
+ char *token = NULL;
+ assert(tmp != NULL);
+
+ while ((token = strsep(&tmp, ",")) != NULL) {
+ int num = atoi(token);
+
+ if (numbers->count >= numbers->cap) {
+ array_expand(numbers);
+ }
+
+ int *data = (int *)numbers->data;
+ data[numbers->count++] = num;
+ }
+
+ free(tmp);
+}
+
+void qs_swap(int *a, int *b) {
+ int tmp = *a;
+ *a = *b;
+ *b = tmp;
+}
+
+long long qs_partition(int *numbers, long long low, long long high) {
+ int pivot = numbers[high];
+ long long i = low - 1;
+ for (long long j = low; j <= high - 1; ++j) {
+ if (numbers[j] < pivot) {
+ i++;
+ qs_swap(&numbers[i], &numbers[j]);
+ }
+ }
+ qs_swap(&numbers[i+1], &numbers[high]);
+ return i + 1;
+}
+
+void qs(int *numbers, long long low, long long high) {
+ if (low < high) {
+ long long p = qs_partition(numbers, low, high);
+ qs(numbers, low, p - 1);
+ qs(numbers, p + 1, high);
+ }
+}
diff --git a/day07/test.txt b/day07/test.txt
@@ -0,0 +1 @@
+16,1,2,0,4,2,7,1,2,14
