From 462062498fe0c6ccb6ac41d993a16b487c56d4a7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89rico=20Nogueira?= <erico.erc@gmail.com>
Date: Wed, 1 Dec 2021 15:57:08 -0300
Subject: [PATCH] Add 2020 advent.

I only completed up to day 5.
---
 2020/day1/data         |  200 +++++++
 2020/day1/day1.c       |   51 ++
 2020/day2/data         | 1000 +++++++++++++++++++++++++++++++++++
 2020/day2/day2.py      |   37 ++
 2020/day3/data         |  323 ++++++++++++
 2020/day3/day3.go      |   75 +++
 2020/day4/data         | 1129 ++++++++++++++++++++++++++++++++++++++++
 2020/day4/day4.bash    |  119 +++++
 2020/day4/example-data |   13 +
 2020/day4/invalid      |   13 +
 2020/day4/valid        |   12 +
 2020/day5/data         |  816 +++++++++++++++++++++++++++++
 2020/day5/day5.lua     |   60 +++
 13 files changed, 3848 insertions(+)
 create mode 100644 2020/day1/data
 create mode 100644 2020/day1/day1.c
 create mode 100644 2020/day2/data
 create mode 100755 2020/day2/day2.py
 create mode 100644 2020/day3/data
 create mode 100644 2020/day3/day3.go
 create mode 100644 2020/day4/data
 create mode 100755 2020/day4/day4.bash
 create mode 100644 2020/day4/example-data
 create mode 100644 2020/day4/invalid
 create mode 100644 2020/day4/valid
 create mode 100644 2020/day5/data
 create mode 100644 2020/day5/day5.lua

diff --git a/2020/day1/data b/2020/day1/data
new file mode 100644
index 0000000..277bb69
--- /dev/null
+++ b/2020/day1/data
@@ -0,0 +1,200 @@
+1593
+1575
+1583
+1609
+1835
+2008
+1638
+1396
+1833
+1524
+1778
+1574
+1653
+1962
+1831
+1557
+1847
+1587
+1876
+1914
+1565
+1585
+1713
+35
+1862
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+1735
+1497
+1989
+1871
+1923
+1917
+1719
+1797
+1222
+1493
+1939
+1139
+1260
+1622
+1625
+1683
+1742
+1996
+1579
+1703
+1692
+1920
+1536
+1965
+1936
+1947
+1800
+1556
+1633
+1530
+1612
+1764
+1810
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+1973
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+1634
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+1602
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+1844
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+1851
+1785
+863
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+1988
+1715
+1881
+1570
+1380
+1956
+777
+1693
+1717
+1724
+1975
+790
+1484
+1822
+1922
+1963
+1741
+1809
+1896
+1837
+1980
+1244
+1832
+1834
+1643
+1775
+1818
+1503
+1802
+1957
+1174
+1826
+1649
+1941
+1571
+1930
+1629
+1502
+2002
+1700
+1880
+1723
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+1617
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+1566
+1616
+1948
+1771
+1627
+1994
+1486
+1913
+1600
+1983
+1501
+2003
+1667
+1620
+1943
+1674
diff --git a/2020/day1/day1.c b/2020/day1/day1.c
new file mode 100644
index 0000000..6a4499b
--- /dev/null
+++ b/2020/day1/day1.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+	FILE *f = fopen("data", "r");
+	if (!f) {
+		return 1;
+	}
+	int lines = 0;
+	for (;;) {
+		char *line = NULL;
+		size_t n = 0;
+		ssize_t e = getline(&line, &n, f);
+		free(line);
+		if (e > 0) {
+			lines++;
+		} else {
+			break;
+		}
+	}
+
+	printf("lines: %d\n", lines);
+	int *v = calloc(sizeof *v, lines);
+
+	fseek(f, 0, 0);
+	for (int i = 0; i < lines; i++) {
+		char *line = NULL;
+		size_t n = 0;
+		getline(&line, &n, f);
+		v[i] = atoi(line);
+		free(line);
+
+		for (int j = 0; j < i; j++) {
+			int sum2 = v[i] + v[j];
+			if (sum2 == 2020) {
+				printf("found match: %d and %d\n", v[i], v[j]);
+				printf("product: %d\n", v[i] * v[j]);
+			} else if (sum2 < 2020) {
+				for (int k = 0; k < j; k++) {
+					if (v[i] + v[j] + v[k] == 2020) {
+						printf("found match: %d and %d and %d\n", v[i], v[j], v[k]);
+						printf("product: %d\n", v[i] * v[j] * v[k]);
+					}
+				}
+			}
+		}
+	}
+
+	fclose(f);
+	free(v);
+}
diff --git a/2020/day2/data b/2020/day2/data
new file mode 100644
index 0000000..da2de15
--- /dev/null
+++ b/2020/day2/data
@@ -0,0 +1,1000 @@
+9-10 b: bbktbbbxhfbpb
+2-10 x: xxnxxxwxxsx
+5-7 w: ghwwdrr
+4-6 z: nzzjzk
+7-8 s: szsssswfs
+12-13 r: rrrrrrrrwrrfh
+9-11 k: vclfkkfcdbwwk
+10-13 v: wcnzkqgvvgxldxl
+4-10 m: mmmmqmcmlmvmm
+9-10 n: nnnnxnnnnr
+5-19 r: drwrmrvprrrdrrrrrkv
+7-10 s: sppscfwscfsszbsf
+2-6 z: zrzshvzlzkxzp
+9-15 f: ffffxffrffwfffffff
+4-6 q: qsqqqqgqqg
+1-4 d: mddd
+3-5 g: qhgsgpjdphghhjwqx
+1-9 b: jqmxlrdbbbfnwtlqjbbf
+2-4 q: qqqq
+5-8 s: ssssswsss
+5-9 n: njnnksntk
+1-11 t: wtttttttttrtttttttt
+1-5 r: rrwgrrck
+4-10 l: jlgxxlgllql
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diff --git a/2020/day2/day2.py b/2020/day2/day2.py
new file mode 100755
index 0000000..8bd5725
--- /dev/null
+++ b/2020/day2/day2.py
@@ -0,0 +1,37 @@
+#!/usr/bin/python3
+
+count = 0
+lines = 0
+count2 = 0 # for part 2
+with open("data", "r") as f:
+    for line in f:
+        lines += 1
+        parts = line.split(' ')
+        amount = parts[0]
+        char = parts[1]
+        pwd = parts[2]
+
+        first, second = amount.split('-')
+        first, second = int(first), int(second)
+
+        c = char[0]
+        cpwd = pwd.count(c)
+        if not first <= cpwd <= second:
+            #print(f"bad: {first}-{second} {c}: {pwd} - has {cpwd}")
+            count += 1
+
+        l = len(pwd)
+        match = 0
+        for p in [first, second]:
+            if l >= p:
+                if pwd[p - 1] == c:
+                    match += 1
+        if match != 1:
+            count2 += 1
+
+print(f'bad count: {count}')
+print(f'good count: {lines - count}')
+print(f'total lines: {lines}')
+
+print(f'2: bad count: {count2}')
+print(f'2: good count: {lines - count2}')
diff --git a/2020/day3/data b/2020/day3/data
new file mode 100644
index 0000000..49c14b1
--- /dev/null
+++ b/2020/day3/data
@@ -0,0 +1,323 @@
+..#.#...#.#.#.##.....###.#....#
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diff --git a/2020/day3/day3.go b/2020/day3/day3.go
new file mode 100644
index 0000000..081eb18
--- /dev/null
+++ b/2020/day3/day3.go
@@ -0,0 +1,75 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"log"
+)
+
+func main() {
+	f, _ := os.Open("data")
+	defer f.Close()
+
+	// arbitrary max length
+	first_line := make([]byte, 255)
+	max_le, _ := f.Read(first_line)
+	repeat_after := 0
+	for i, c := range first_line {
+		if c == '\n' {
+			repeat_after = i
+			break
+		}
+		if i == max_le {
+			log.Fatal("line too long!")
+		}
+	}
+
+	fmt.Printf("line length: %d\n", repeat_after)
+	// arbitrary max lines
+	themap := make([][]byte, 1000)
+	for i := range themap {
+		themap[i] = make([]byte, repeat_after)
+	}
+
+	f.Seek(0, 0)
+	scanner := bufio.NewScanner(f)
+	ln := 0
+	for scanner.Scan() {
+		copy(themap[ln], scanner.Bytes())
+		ln += 1
+	}
+
+	// movement: right,down
+	// 1,1 - 3,1 - 5,1 - 7,1
+	counts := []int{0, 0, 0, 0}
+	hoff := []int{1, 3, 5, 7}
+	// 1,2
+	count2 := 0
+	// (v,h): vertical and horizontal
+	for v := 0; v < ln; v++ {
+		for i := range counts {
+			h:= (v * hoff[i]) % repeat_after
+			if themap[v][h] == '#' {
+				counts[i]++
+			}
+		}
+
+		if v % 2 == 0 {
+			h := (v / 2) % repeat_after
+			if themap[v][h] == '#' {
+				count2++
+			}
+		}
+	}
+
+	// part 1
+	fmt.Printf("total trees: %d\n", counts[1])
+	// part 2
+	mul := 1
+	for _, v := range counts {
+		mul *= v
+	}
+	mul *= count2
+	fmt.Printf("product of total trees: %d\n", mul)
+}
diff --git a/2020/day4/data b/2020/day4/data
new file mode 100644
index 0000000..c55a2a9
--- /dev/null
+++ b/2020/day4/data
@@ -0,0 +1,1129 @@
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+
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+
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+
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+
+byr:2001 iyr:2015
+hgt:159cm hcl:#623a2f ecl:#3303fc
+pid:86352609 eyr:2030
+
+pid:392475721 ecl:brn byr:1927 iyr:2014 eyr:2024 hcl:#fffffd
+
+hgt:160cm eyr:2022 byr:1979 iyr:2010
+pid:974489456
+hcl:#efcc98
+
+ecl:grn eyr:2024
+hgt:166cm byr:1961
+pid:221051556
+hcl:#6b5442
+iyr:2028
+
+iyr:2010 cid:156
+byr:2005 hgt:155cm ecl:amb eyr:1988
+hcl:#866857
+pid:169cm
+
+eyr:2038 byr:1991 pid:#9b82ce
+iyr:2027 hcl:z
+cid:278 hgt:59cm ecl:#179d81
+
+ecl:blu hgt:151cm
+iyr:2013
+cid:117 pid:129843687 hcl:#c429e7 byr:1961
+eyr:2022
+
+hcl:#602927 byr:1996 pid:507775673 eyr:2020 hgt:153cm ecl:oth
+cid:251 iyr:2010
+
+hgt:170cm ecl:oth iyr:2010 eyr:2025 hcl:#602927 byr:1983 pid:113809908
+
+hcl:#c0946f pid:172142380
+iyr:2017 byr:1926
+hgt:190cm eyr:2028
+ecl:brn
+
+pid:812443511 hcl:#6b5442 eyr:2021 ecl:amb
+cid:60 iyr:2017 hgt:157cm byr:1926
+
+hgt:177cm
+ecl:gry eyr:2022 hcl:#888785 pid:570572334 byr:1943 iyr:2017
+
+pid:#967cbc hcl:z byr:2020 ecl:oth eyr:2035 iyr:2015
+cid:99 hgt:65cm
+
+iyr:2019 pid:285935311 hcl:#4c1ee4 byr:1954 eyr:2028 hgt:157cm
+
+ecl:xry eyr:1939
+pid:192cm
+hgt:114
+hcl:b97555 byr:2004 iyr:1970
+
+ecl:grn byr:2021 iyr:2030
+hcl:z pid:305489303 hgt:61cm eyr:2020
+
+eyr:2036 hgt:179cm
+pid:#8be5f5 byr:1981
+hcl:#cb5848 iyr:2015
+
+iyr:2011 ecl:oth hgt:176cm cid:344 pid:539941547 hcl:#efcc98
+
+eyr:1987 ecl:amb
+byr:2029 pid:046017350
+cid:182 iyr:2011 hcl:z hgt:191cm
+
+iyr:2019 byr:1948 eyr:2020 ecl:hzl hgt:176cm hcl:#733820 pid:235101182
+
+ecl:hzl
+eyr:2029 pid:262843012 hgt:76in hcl:#efcc98 iyr:2015 byr:1931
+
+iyr:2011 ecl:blu hgt:184cm
+byr:1945
+hcl:#c0946f pid:105042852
+
+iyr:2010
+pid:485638522 hcl:949a37 eyr:2030
+hgt:193cm
+ecl:gry byr:2021
+
+pid:565896801 eyr:2029 hcl:#fffffd ecl:amb iyr:2016 byr:1977
+hgt:170cm
+
+byr:1987
+hcl:#c0946f pid:931311386
+iyr:2010 eyr:2022
+
+eyr:2030
+hgt:177cm hcl:#a97842 byr:1978
+ecl:hzl pid:358177000
+iyr:2014
+
+iyr:2025
+pid:3639383157 cid:82 hcl:f2aec0 hgt:179cm
+eyr:1944 byr:1969
+ecl:#e167d3
+
+hgt:107 ecl:gmt iyr:2030 hcl:#866857 byr:2026 eyr:1990 pid:#87773e
+
+cid:220 hcl:z iyr:1921 hgt:65cm byr:1998 ecl:#34397f eyr:2035
+
+hcl:44e552 pid:#6f341e ecl:#59aeb1
+eyr:1926 hgt:187 iyr:1988
+byr:1991
+
+hcl:z hgt:70cm pid:653386115 iyr:1964 byr:2026 cid:103
+ecl:#b81c45 eyr:2034
+
+hcl:#623a2f cid:307 pid:204266921 hgt:172cm
+iyr:2012
+ecl:hzl
+eyr:2021
+byr:1984
+
+hgt:192cm
+byr:1930 pid:39349843 hcl:#866857 iyr:2013 cid:130 ecl:blu eyr:1962
+
+cid:97 eyr:2036 pid:#279c0b ecl:dne hgt:186in iyr:1973 hcl:691266
+
+byr:2026 hgt:185cm hcl:z ecl:grt pid:#562f7a eyr:1986 iyr:2029
+
+ecl:brn
+hcl:#b6652a eyr:2028
+pid:570023672
+byr:1988 hgt:162cm iyr:2015
+
+hgt:180in ecl:zzz hcl:5b1477 byr:2024
+eyr:2028
+pid:#b03174
+
+pid:157cm eyr:1989 hgt:188cm
+iyr:2015
+hcl:3362a9 ecl:gry byr:2027
+
+pid:111584950
+byr:1941 ecl:grn iyr:2013 hgt:179cm hcl:#866857
+eyr:2024
+
+ecl:#7f4baa
+iyr:2015 hcl:de1367
+eyr:2024 byr:1959
+pid:#cf4e78 hgt:60cm
+
+byr:2024 eyr:1953 pid:21579220
+hgt:179
+cid:94
+hcl:#a97842
+iyr:1977 ecl:xry
+
+hgt:179cm eyr:2020
+ecl:hzl hcl:#efcc98
+pid:905622096 byr:1929
+
+ecl:oth
+byr:2001 eyr:2008 iyr:2020
+hcl:#ceb3a1 pid:244298637 hgt:160cm
+
+eyr:2030
+byr:1972 hcl:#341e13
+ecl:grn iyr:2014 pid:274475554 hgt:71in
+
+byr:1938 hcl:z iyr:1956 pid:153cm hgt:62cm ecl:grt
+eyr:2036
+
+hgt:177cm cid:276 iyr:1921 hcl:19aa96 pid:843799864 eyr:2033
+ecl:#812d68
+
+pid:686496844
+ecl:brn hcl:#733820
+byr:1948 iyr:2010 eyr:2020
+hgt:164cm
+
+pid:39436322 ecl:blu hcl:25b3d4 hgt:185in
+iyr:2019 byr:1959 eyr:2022
+
+pid:119603708 hcl:#866857 byr:1983 hgt:157cm iyr:1978 ecl:hzl eyr:1945
+
+cid:331 hcl:z iyr:2017
+pid:255988517
+byr:2015
+eyr:2020 ecl:amb
+hgt:171
+
+hgt:180cm iyr:2013 ecl:brn
+hcl:#602927 byr:1943
+pid:898265221 eyr:2025
+
+eyr:2024
+hgt:163cm
+pid:892793767 byr:1971 ecl:oth iyr:2013 cid:119 hcl:#02f6b3
+
+byr:1920 cid:221
+pid:#7515a7 hgt:160in
+eyr:1921 iyr:1983 hcl:z
+
+byr:2029 hcl:z hgt:75cm eyr:1975 pid:184cm iyr:1992 ecl:dne
+
+iyr:1990
+hgt:174in eyr:1961 ecl:brn
+hcl:#a3313e byr:2029
+
+hgt:191cm eyr:2026 iyr:2019 ecl:brn
+byr:1930 hcl:#7d3b0c cid:174
+
+ecl:amb iyr:2015 hgt:163cm
+pid:664966673 hcl:#602927 eyr:2026 cid:229 byr:1941
+
+pid:3123244013 eyr:2037 iyr:2022 hcl:103dfa
+hgt:156cm byr:2027 ecl:gmt cid:195
+
+cid:151 ecl:blu pid:693382940
+iyr:2011 byr:1954
+hgt:170cm eyr:2030 hcl:#866857
+
+hcl:#341e13 eyr:2023 byr:1948 iyr:2010 pid:607929427
+ecl:oth hgt:160cm
+
+hcl:#c0946f
+ecl:brn
+hgt:189cm
+cid:116 iyr:2013 pid:277606931
+byr:1975
+
+eyr:2027
+cid:206 ecl:gry iyr:2010 hcl:#866857 byr:1997 hgt:190cm pid:687577894
+
+eyr:2029 iyr:2015 pid:681485527
+byr:1925 hgt:152cm
+ecl:amb hcl:#341e13
+
+eyr:2030
+hcl:#c396d9
+hgt:159cm pid:686268817
+ecl:brn byr:1983
+iyr:2017
+
+eyr:2038 byr:2012
+cid:303
+iyr:1941 hcl:z ecl:utc pid:203595168
+hgt:71cm
+
+pid:863355278 hcl:#888785
+iyr:2018
+byr:1953 eyr:2022 hgt:167cm
+ecl:amb
+
+pid:141244310 eyr:2025 hcl:#733820 ecl:amb hgt:154cm cid:61 iyr:2017
+byr:1929
+
+pid:361065637
+hcl:#623a2f byr:1964 iyr:2015 eyr:2027 ecl:gry hgt:67in
+
+cid:117 ecl:brn iyr:2025 byr:1982
+hcl:#ceb3a1 hgt:185cm
+pid:34652522
+
+cid:275 ecl:#7a4722 eyr:2001 byr:2018 iyr:1995
+hgt:105
+pid:95250112 hcl:z
+
+iyr:2017 ecl:amb hgt:152cm hcl:#733820 cid:57 eyr:2020 pid:701621326
+byr:1944
+
+hcl:#18171d
+ecl:brn iyr:2015 hgt:175cm eyr:2028 pid:311636591 cid:113
+byr:1979
+
+ecl:grn
+hgt:185cm
+pid:920998407 iyr:2016 byr:1930 eyr:2029 hcl:#7d3b0c
+
+iyr:2021 eyr:1931
+hcl:z byr:2010
+hgt:177in
+pid:#cfb659 ecl:zzz
+
+cid:171 hcl:#888785 iyr:2010 byr:1970 ecl:hzl
+pid:141430645 hgt:160cm
+eyr:2026
+
+hgt:172cm ecl:gry
+pid:428207256 cid:237 hcl:#733820 iyr:2012
+eyr:2027 byr:1951
+
+hgt:70cm cid:76 ecl:#c544c3 byr:2019
+pid:6133497812
+hcl:#efcc98
+eyr:2037 iyr:2015
+
+hgt:176in pid:582383714 byr:1980 ecl:amb hcl:08097e iyr:2020 eyr:2021
+
+ecl:oth
+eyr:2024
+hgt:176cm byr:1923
+iyr:2014 pid:737058734
+hcl:#b6652a cid:203
+
+ecl:amb
+eyr:2029
+hgt:186cm
+pid:440986981 iyr:2010 hcl:#cfa07d
+byr:1967
+
+pid:8729818647 hcl:z
+ecl:#ae70eb cid:168 hgt:161cm iyr:2030
+eyr:2020 byr:2022
+
+hcl:#43a092 hgt:165cm byr:1961
+pid:026098019
+iyr:2019 eyr:2020 ecl:amb
+
+cid:154 hgt:192cm
+eyr:2016 iyr:2030
+ecl:brn pid:#8e0762 byr:2020
+
+hgt:175cm ecl:brn byr:1944
+pid:553456151 iyr:2016 eyr:2027 hcl:#085f41
+
+ecl:gry
+byr:1975 eyr:2025 cid:122 pid:111078821
+hcl:#b6652a iyr:2015
+hgt:151cm
+
+hgt:159cm pid:946458516 eyr:2020 hcl:#a97842 byr:1972
+iyr:2016 cid:88 ecl:oth
+
+eyr:2023
+cid:156
+byr:1999
+hgt:186cm hcl:#fffffd pid:499141155
+ecl:grn
+
+hcl:#888785 hgt:165cm pid:864544116
+ecl:gry byr:1937
+iyr:2020 eyr:2026
+
+hgt:155cm
+iyr:2018 ecl:blu
+hcl:#a97842
+byr:1994 eyr:2024
+
+eyr:2021 iyr:2019 hgt:175cm cid:127 byr:1982 hcl:#888785 ecl:amb
+
+eyr:2022 iyr:2011 ecl:blu
+pid:202081532 hcl:z hgt:177in byr:1923
+
+iyr:2017 cid:213 hcl:#fffffd
+ecl:hzl
+hgt:193cm pid:564823661 byr:1966 eyr:2030
+
+hcl:#623a2f iyr:2014 hgt:177cm byr:1950 ecl:amb
+cid:290 eyr:2025 pid:669369557
+
+hgt:67cm
+eyr:2028 ecl:brn
+hcl:411b18 pid:222472243
+
+byr:1981 ecl:gry hcl:#b6652a eyr:2033 iyr:1943 pid:832989613 hgt:167cm
+
+byr:1970
+cid:172 hcl:#64fbcb eyr:2007
+ecl:hzl pid:982450142
+hgt:61cm iyr:2019
+
+eyr:2025
+hgt:161cm iyr:1962
+pid:394421140
+ecl:gry
+cid:209 hcl:#efcc98 byr:2001
diff --git a/2020/day4/day4.bash b/2020/day4/day4.bash
new file mode 100755
index 0000000..5f611e5
--- /dev/null
+++ b/2020/day4/day4.bash
@@ -0,0 +1,119 @@
+#!/bin/bash
+
+isyear() {
+	case $1 in
+		[[:digit:]][[:digit:]][[:digit:]][[:digit:]])
+			;;
+		*)
+			return 1
+			;;
+	esac
+}
+
+check_pass() {
+	e=
+
+	# ignore cid
+	for f in byr iyr eyr hgt hcl ecl pid
+	do
+		if [[ "$1" != *"${f}:"* ]]; then
+			return 1
+		fi
+	done
+
+	f=
+
+	# validate each
+	for v in $1
+	do
+		e=${v#*:}
+		case "$v" in
+			byr:*)
+				isyear $e || return 1
+				[ $e -lt 1920 -o $e -gt 2002 ] && return 1
+				;;
+			iyr:*)
+				isyear $e || return 1
+				[ $e -lt 2010 -o $e -gt 2020 ] && return 1
+				;;
+			eyr:*)
+				isyear $e || return 1
+				[ $e -lt 2020 -o $e -gt 2030 ] && return 1
+				;;
+			hgt:*)
+				case $e in
+					*cm)
+						m=${e%cm}
+						[ $m -lt 150 -o $m -gt 193 ] && return 1
+						;;
+					*in)
+						m=${e%in}
+						[ $m -lt 59 -o $m -gt 76 ] && return 1
+						;;
+					*)
+						return 1
+						;;
+				esac
+				;;
+			hcl:*)
+				case $e in
+					\#[[:xdigit:]][[:xdigit:]][[:xdigit:]][[:xdigit:]][[:xdigit:]][[:xdigit:]])
+						;;
+					*)
+						return 1
+						;;
+				esac
+				;;
+			ecl:*)
+				case $e in
+					amb|blu|brn|gry|grn|hzl|oth)
+						;;
+					*)
+						return 1
+						;;
+				esac
+				;;
+			pid:*)
+				case $e in
+					[[:digit:]][[:digit:]][[:digit:]][[:digit:]][[:digit:]][[:digit:]][[:digit:]][[:digit:]][[:digit:]])
+						;;
+					*)
+						return 1
+						;;
+				esac
+				;;
+		esac
+	done
+
+	return 0
+}
+
+total_count=0
+invalid_count=0
+
+total=
+while read -r input
+do
+	if [ -n "$input" ]; then
+		total+=" $input"
+	else
+		if ! check_pass "$total"; then
+			invalid_count=$(($invalid_count + 1))
+			[ "$f" ] && echo missing $f $total
+			[ "$e" ] && echo bad value $e - $total
+		fi
+		total=
+		total_count=$(($total_count + 1))
+	fi
+done < data
+
+# count trailing data
+total_count=$(($total_count + 1))
+if ! check_pass "$total"; then
+	invalid_count=$(($invalid_count + 1))
+	[ "$e" ] && echo bad value $e - $total
+fi
+
+echo "total: $total_count"
+echo "inval: $invalid_count"
+echo "  val: $(($total_count - $invalid_count))"
diff --git a/2020/day4/example-data b/2020/day4/example-data
new file mode 100644
index 0000000..0ff208e
--- /dev/null
+++ b/2020/day4/example-data
@@ -0,0 +1,13 @@
+ecl:gry pid:860033327 eyr:2020 hcl:#fffffd
+byr:1937 iyr:2017 cid:147 hgt:183cm
+
+iyr:2013 ecl:amb cid:350 eyr:2023 pid:028048884
+hcl:#cfa07d byr:1929
+
+hcl:#ae17e1 iyr:2013
+eyr:2024
+ecl:brn pid:760753108 byr:1931
+hgt:179cm
+
+hcl:#cfa07d eyr:2025 pid:166559648
+iyr:2011 ecl:brn hgt:59in
diff --git a/2020/day4/invalid b/2020/day4/invalid
new file mode 100644
index 0000000..a7fa5bb
--- /dev/null
+++ b/2020/day4/invalid
@@ -0,0 +1,13 @@
+eyr:1972 cid:100
+hcl:#18171d ecl:amb hgt:170 pid:186cm iyr:2018 byr:1926
+
+iyr:2019
+hcl:#602927 eyr:1967 hgt:170cm
+ecl:grn pid:012533040 byr:1946
+
+hcl:dab227 iyr:2012
+ecl:brn hgt:182cm pid:021572410 eyr:2020 byr:1992 cid:277
+
+hgt:59cm ecl:zzz
+eyr:2038 hcl:74454a iyr:2023
+pid:3556412378 byr:2007
diff --git a/2020/day4/valid b/2020/day4/valid
new file mode 100644
index 0000000..ca41800
--- /dev/null
+++ b/2020/day4/valid
@@ -0,0 +1,12 @@
+pid:087499704 hgt:74in ecl:grn iyr:2012 eyr:2030 byr:1980
+hcl:#623a2f
+
+eyr:2029 ecl:blu cid:129 byr:1989
+iyr:2014 pid:896056539 hcl:#a97842 hgt:165cm
+
+hcl:#888785
+hgt:164cm byr:2001 iyr:2015 cid:88
+pid:545766238 ecl:hzl
+eyr:2022
+
+iyr:2010 hgt:158cm hcl:#b6652a ecl:blu byr:1944 eyr:2021 pid:093154719
diff --git a/2020/day5/data b/2020/day5/data
new file mode 100644
index 0000000..d9e3a32
--- /dev/null
+++ b/2020/day5/data
@@ -0,0 +1,816 @@
+FBFBFBFRRL
+BFBBFFFRRL
+FFBFFFFRLL
+BFFFBBBRLL
+BBFFBFBLLR
+FFFFBBBRLR
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diff --git a/2020/day5/day5.lua b/2020/day5/day5.lua
new file mode 100644
index 0000000..a3ad028
--- /dev/null
+++ b/2020/day5/day5.lua
@@ -0,0 +1,60 @@
+max_id_possible = 127 * 7 + 7
+--[[ table to hold seats accounted for --]]
+occupied = {}
+for i = 0,max_id_possible
+do
+	occupied[i] = false
+end
+
+--[[ max id in data --]]
+m = 0
+for l in io.lines("data")
+do
+	row1 = 0
+	row2 = 127
+	for i = 1,7,1
+	do
+		c = l:sub(i,i)
+		median = (row1 + row2) / 2
+		if (c == 'F')
+		then
+			row2 = math.floor(median)
+		else
+			row1 = math.ceil(median)
+		end
+	end
+	col1 = 0
+	col2 = 7
+	for i = 8,10,1
+	do
+		c = l:sub(i,i)
+		median = (col1 + col2) / 2
+		if (c == 'L')
+		then
+			col2 = math.floor(median)
+		else
+			col1 = math.ceil(median)
+		end
+	end
+
+	id = row1 * 8 + col1
+	if (id > m)
+	then
+		m = id
+	end
+
+	occupied[id] = true
+end
+
+print("max id: ", m)
+
+for i = 0,max_id_possible
+do
+	if (occupied[i] == false)
+	then
+		if(occupied[i-1] and occupied[i+1])
+		then
+			print("your id: ", i)
+		end
+	end
+end