From 7ce37165f7fa95e44c860e7a7dc4acfc10810265 Mon Sep 17 00:00:00 2001
From: "Alexander \"Arav\" Andreev" <me@arav.su>
Date: Sat, 2 Dec 2023 19:45:58 +0400
Subject: [PATCH] Day 2 part 2 complete!

---
 Makefile  |  2 +-
 day2/p2.c | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 test      |  9 ++++--
 3 files changed, 103 insertions(+), 3 deletions(-)
 create mode 100644 day2/p2.c

diff --git a/Makefile b/Makefile
index d85c7df..ebcda30 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ day1: day1/p1.c day1/p2.c
 
 day2: day2/p1.c day2/p2.c
 	${CC} ${CFLAGS} $@/p1.c -o bin/$@p1
-# ${CC} ${CFLAGS} $@/p2.c -o bin/$@p2
+	${CC} ${CFLAGS} $@/p2.c -o bin/$@p2
 
 
 clean:
diff --git a/day2/p2.c b/day2/p2.c
new file mode 100644
index 0000000..56dfd85
--- /dev/null
+++ b/day2/p2.c
@@ -0,0 +1,95 @@
+#define  _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+
+// parse_number takes a position of a last digit in a number
+// and returns a resulting number.
+int32_t parse_number(char *end);
+
+
+#define STR_E(tok) #tok
+#define STR(tok) STR_E(tok)
+
+
+#define SETS_STR_MAX_LEN 200
+
+
+#define CUBE_RED 0
+#define CUBE_GREEN 1
+#define CUBE_BLUE 2
+
+
+int main(int argc, char **argv) {
+    FILE *input;
+    char *line = NULL;
+    size_t line_length = 0;
+
+    if (argc == 1 || argv[1][0] == '-')
+		input = stdin;
+	else if ((input = fopen(argv[1], "r")) == NULL) {
+		printf("Cannot open file %s\n", argv[1]);
+		return -1;
+	}
+
+    int32_t power_sum = 0;
+
+    while (getline(&line, &line_length, input) != -1) {
+        char *colon_pos = strchr(line, ':');
+
+        char *sets = colon_pos + 2;
+        char *space_pos = NULL;
+
+        int8_t cubes[3] = {0};
+
+        while (NULL != (space_pos = strchr(sets, ' '))) {
+            if (*(space_pos-1) == ',' || *(space_pos-1) == ';') {
+                sets = space_pos + 1;
+                continue;
+            }
+
+            int8_t n = parse_number(space_pos-1);
+
+            switch (*(space_pos+1)) {
+                case 'r':
+                    if (cubes[CUBE_RED] < n)
+                        cubes[CUBE_RED] = n;
+                    break;
+                case 'g':
+                    if (cubes[CUBE_GREEN] < n)
+                        cubes[CUBE_GREEN] = n;
+                    break;
+                case 'b':
+                    if (cubes[CUBE_BLUE] < n)
+                        cubes[CUBE_BLUE] = n;
+                    break;
+            }
+
+            sets = space_pos + 1;
+        }
+
+        power_sum += cubes[CUBE_RED] * cubes[CUBE_GREEN] * cubes[CUBE_BLUE];
+
+        memset(line, 0, line_length);
+    }
+
+    printf("%d\n", power_sum);
+
+    return 0;
+}
+
+int32_t parse_number(char *end) {
+    int32_t num = 0;
+
+    for (size_t n = 1;; n *= 10) {
+        if (*end>>4 != 0x3)
+            break;
+        num += (*end&0xf) * n;
+        --end;
+    }
+
+    return num;
+}
\ No newline at end of file
diff --git a/test b/test
index 70674e0..8b5eec8 100755
--- a/test
+++ b/test
@@ -1,8 +1,13 @@
 #!/usr/bin/sh
 
+set -e
+
 test_case() {
 	[[ $(bin/day$1p$2 < day$1/in.$3) = "$4" ]] && { echo -ne "\e[32mpassed\e[0m"; } || { echo -ne "\e[31mfailed\e[0m"; }
 }
 
-echo "Day $1 with test data part 1 $(test_case $1 1 "test" "142"), and part 2 $(test_case $1 2 "test2" "281").";
-echo "Day $1 with my data part 1 $(test_case $1 1 "my" "55621"), and part 2 $(test_case $1 2 "my" "53592").";
\ No newline at end of file
+echo "Day 1 with test data part 1 $(test_case 1 1 "test" "142"), and part 2 $(test_case 1 2 "test2" "281").";
+echo "Day 1 with my data part 1 $(test_case 1 1 "my" "55621"), and part 2 $(test_case 1 2 "my" "53592").";
+
+echo "Day 2 with test data part 1 $(test_case 2 1 "test" "8"), and part 2 $(test_case 2 2 "test" "2286").";
+echo "Day 2 with my data part 1 $(test_case 2 1 "my" "2727"), and part 2 $(test_case 2 2 "my" "56580").";
\ No newline at end of file