add a couple of days

4 files changed, 220 insertions, 0 deletions

diff --git a/Advent-of-Code-2022/aoc-25/build.sh b/Advent-of-Code-2022/aoc-25/build.sh
new file mode 100755
index 0000000..30f495e
--- /dev/null
+++ b/Advent-of-Code-2022/aoc-25/build.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -xe
+
+gcc -o main main.c -Wall -Wextra -pedantic
diff --git a/Advent-of-Code-2022/aoc-25/input.txt b/Advent-of-Code-2022/aoc-25/input.txt
new file mode 100644
index 0000000..8e7a4d1
--- /dev/null
+++ b/Advent-of-Code-2022/aoc-25/input.txt
@@ -0,0 +1,113 @@
+1=0-12100-==
+12=2=21=2-1=1122
+1=-1112=-12
+1--2210
+2-1110-
+1=-1-
+1112
+220--0
+20=--==0
+12-00-
+21=21001-0
+1=101-=111-0==--
+2
+10-=1==-102-020==
+2=12
+11=02=11-=2=2
+1=--2111010-
+12210=1-=-
+221=-=210-2=0=00-
+11012
+22002====21
+1-202202--2-2
+1-=110--
+1021-
+10-1--
+100-11=--=020
+2=01-=2-200-
+10--11201011
+1-=-
+10=-122-00=-0110
+122-2
+120-01--012-1202-
+22=2=1=10221-=2
+1-=1
+1122-=-
+1=1-02101-
+1-=1=2-211
+12221-1-00
+2--10=-0-1===2
+120120=2110121020-
+22=2-2=0
+1=2=0=201221101-==
+20=-122
+211=1122=21=101
+1=0-2020==102===
+10-1-00
+1=221202=22
+1=20-0=12==-
+1-2=0120=2001-0101
+11--000-
+11
+21-00221020-12
+1--0=2==10=-=00
+121001=2000
+2=20--2=-0=-=2-11-0
+1=0=1120=
+1=-=0
+10-2
+21-0=0
+2=-=-0
+1=-0-2=
+1=2--112=10--1=2
+2---20=-10-00
+101020110
+102=12-1022==01-0
+10=---11
+2-=--00100=-
+122=-=---
+1---==0012=110=
+12=
+10-20020-==0=1
+1022==2=2-
+1212-02--=2=-0-210
+1121201=01-==2
+1=1==20=-1=
+1=-
+212=0=21110
+21==20-
+1=-=-111020---21--=
+111=0---=2=2
+112
+1--=11101==022202-1
+1=1=-=0-1-1=00-2
+1=01020=1
+102-220-2
+1--1=022020
+21-01=
+1-0--=011
+2010
+10==1
+12=222-22--2021-21
+1=1121-2-1-201=
+2211
+2=220-=2=-2=-1
+1=10-1
+1-12-022101=11-22=-2
+11200==1
+1=1-0100=--21201-0
+2=2=2-2==--
+112-=
+120
+212222-0=1111=21-=
+100-02---0110
+2202212-02-10
+1-=0101-1=2
+2101110111--
+1=11-21122==12-
+2-0=200=011==-12=
+2==-0022-20
+1==001211=22201==
+12211=10-0=
+1-00-101-==-
+1-=1=222000=2==
diff --git a/Advent-of-Code-2022/aoc-25/main.c b/Advent-of-Code-2022/aoc-25/main.c
new file mode 100644
index 0000000..c88d918
--- /dev/null
+++ b/Advent-of-Code-2022/aoc-25/main.c
@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if 0
+  #define FILENAME "sample.txt"
+#else
+  #define FILENAME "input.txt"
+#endif
+
+int char_to_int[256] = {
+    ['1'] =  1,
+    ['2'] =  2,
+    ['0'] =  0,
+    ['-'] = -1,
+    ['='] = -2
+};
+
+char int_to_char[5] = {
+    '=', '-', '0', '1', '2'
+};
+
+long long sum = 0;
+
+void encode()
+{
+    signed char num[1000] = {0};
+    size_t num_sz = 0;
+
+    for(long long n = sum; n > 0; n /= 5, num_sz++) {
+        num[num_sz] += n % 5;
+        num[num_sz+1] += num[num_sz]/5;
+        num[num_sz] %= 5;
+
+        if(num[num_sz] == 3) {
+            num[num_sz] = -2;
+            num[num_sz+1] += 1;
+        } else if(num[num_sz] == 4) {
+            num[num_sz] = -1;
+            num[num_sz+1] += 1;
+        }
+    }
+
+    for(int i = num_sz-1; i >= 0; i--) {
+        printf("%c", int_to_char[num[i]+2]);
+    }
+
+    printf("\n");
+}
+
+long long decode(char *num)
+{
+    long long n = 0;
+
+    size_t len = strlen(num);
+    long long power_of_5 = 1;
+
+    for(int i = len-1; i >= 0; i--) {
+        n += power_of_5 * char_to_int[num[i]];
+        power_of_5 *= 5;
+    }
+
+    return n;
+}
+
+void parse()
+{
+    FILE *fp = fopen(FILENAME, "r");
+    if(!fp) {
+        fprintf(stderr, "ERROR: Could not open file %s\n", FILENAME);
+        exit(1);
+    }
+
+    char line[256];
+    while(fgets(line, sizeof(line), fp) != NULL) {
+        if(line[strlen(line)-1] == '\n')
+            line[strlen(line)-1] = '\0';
+        sum += decode(line);
+    }
+
+    fclose(fp);
+}
+
+int main(void)
+{
+    parse();
+    encode();
+    return 0;
+}
diff --git a/Advent-of-Code-2022/aoc-25/sample.txt b/Advent-of-Code-2022/aoc-25/sample.txt
new file mode 100644
index 0000000..027aeec
--- /dev/null
+++ b/Advent-of-Code-2022/aoc-25/sample.txt
@@ -0,0 +1,13 @@
+1=-0-2
+12111
+2=0=
+21
+2=01
+111
+20012
+112
+1=-1=
+1-12
+12
+1=
+122