2020 days 4 and 5

10 files changed, 2374 insertions, 0 deletions

diff --git a/Advent-of-Code-2020/AOC-4/build.sh b/Advent-of-Code-2020/AOC-4/build.sh
new file mode 100755
index 0000000..6be9241
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-4/build.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -xe
+
+gcc -o main -Wall -Wextra main.c
+
+./main
diff --git a/Advent-of-Code-2020/AOC-4/example-invalid.txt b/Advent-of-Code-2020/AOC-4/example-invalid.txt
new file mode 100644
index 0000000..68287d5
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-4/example-invalid.txt
@@ -0,0 +1,14 @@
+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
+EOF
diff --git a/Advent-of-Code-2020/AOC-4/example-valid.txt b/Advent-of-Code-2020/AOC-4/example-valid.txt
new file mode 100644
index 0000000..a2614f8
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-4/example-valid.txt
@@ -0,0 +1,13 @@
+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
+EOF
diff --git a/Advent-of-Code-2020/AOC-4/example.txt b/Advent-of-Code-2020/AOC-4/example.txt
new file mode 100644
index 0000000..58190a3
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-4/example.txt
@@ -0,0 +1,14 @@
+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
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+hgt:179cm
+
+hcl:#cfa07d eyr:2025 pid:166559648
+iyr:2011 ecl:brn hgt:59in
+EOF
diff --git a/Advent-of-Code-2020/AOC-4/input.txt b/Advent-of-Code-2020/AOC-4/input.txt
new file mode 100644
index 0000000..1d41d0b
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-4/input.txt
@@ -0,0 +1,1130 @@
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+cid:308 ecl:hzl
+hgt:174cm pid:226138254
+eyr:2028
+iyr:2018
+
+ecl:brn hgt:62in
+eyr:2020 hcl:#ceb3a1 pid:650916481
+byr:1940
+iyr:2018
+
+hcl:#efcc98 ecl:brn
+byr:1940 eyr:2024 pid:#68d3ab
+hgt:177cm cid:83
+iyr:2017
+
+pid:9704738756 hcl:#fffffd eyr:1925
+iyr:2019 byr:1929 ecl:blu hgt:191cm
+
+ecl:brn hgt:151cm hcl:#c0946f iyr:2018 pid:602505609 eyr:2020
+byr:1974
+
+hgt:178cm
+eyr:2023 byr:1922
+iyr:2013
+hcl:#fffffd pid:205291054 ecl:blu
+
+byr:1985
+iyr:2016 hcl:#ceb3a1 hgt:161cm eyr:2030 ecl:amb
+pid:871809978
+
+iyr:2027 ecl:#d9c9cb hgt:110
+eyr:2034
+hcl:99d4ee pid:13355969 cid:168
+
+ecl:utc byr:2019
+iyr:2016 hgt:173in cid:266
+hcl:z eyr:2033
+pid:1835189643
+
+pid:364874100 ecl:amb hcl:#6b5442 hgt:184cm
+iyr:2017 eyr:2026 byr:1920 cid:127
+
+ecl:dne eyr:2020
+byr:2018 cid:262
+iyr:2010 hgt:60cm
+pid:95409983 hcl:z
+
+eyr:2026
+pid:135963889 iyr:2018 hcl:#ceb3a1
+ecl:amb
+
+hcl:#341e13 eyr:2028 iyr:2014 byr:1978
+cid:309
+pid:503628987
+ecl:oth hgt:159cm
+
+hcl:#a97842
+pid:171194014 hgt:193cm eyr:2023
+byr:1945 ecl:grt
+iyr:2019
+
+eyr:1967 cid:135 hcl:z
+ecl:gmt
+iyr:2024 pid:#a87744
+byr:2023 hgt:168cm
+
+pid:169cm
+cid:337 ecl:hzl hcl:#888785 byr:1927 hgt:153cm
+iyr:2022 eyr:2020
+
+byr:1963 hcl:#fffffd eyr:2021
+hgt:62in pid:702188504 iyr:2013
+ecl:hzl
+
+iyr:2024 ecl:amb hcl:#ceb3a1
+eyr:2017 pid:49752568 hgt:179cm byr:1938
+
+byr:2006
+ecl:#08021a
+eyr:2022 pid:520309937
+hgt:61in hcl:#ceb3a1
+iyr:2013
+
+hgt:150cm hcl:#733820 byr:1971 ecl:zzz cid:347
+iyr:2020 eyr:2020 pid:6028818045
+
+byr:2005 hgt:69cm
+ecl:lzr hcl:z iyr:2009 eyr:2038 pid:79626157
+
+iyr:2020 byr:2015 pid:882923693 hcl:#888785 eyr:2030
+ecl:xry hgt:65in
+
+hcl:z hgt:187cm pid:4397913655 iyr:1973 eyr:1925
+ecl:#93ae1a
+
+hgt:169cm
+iyr:2019 eyr:2023 pid:678937529
+ecl:blu byr:1998 hcl:#fffffd
+
+cid:87 hcl:#efcc98
+ecl:#e56390
+iyr:2013 hgt:191in
+eyr:2027 pid:923358773 byr:1960
+
+hgt:190cm byr:1939
+cid:55 eyr:2026 ecl:blu hcl:#623a2f pid:363917612
+iyr:2012
+
+pid:177cm hgt:165cm cid:276 eyr:2002 byr:2010 hcl:#7bea4c iyr:2017
+ecl:grt
+
+byr:2023 eyr:2031
+iyr:1987 hgt:172 hcl:z
+pid:4973557135 ecl:#7517e2
+
+eyr:2036 iyr:1989 ecl:#ef5492 hgt:188in pid:#b50065
+hcl:92e9ee byr:2015
+
+pid:873654822 iyr:2016 cid:310
+hgt:76in
+eyr:2029 hcl:#888785 byr:1958
+ecl:brn
+
+iyr:2013 ecl:amb byr:2024
+hgt:166cm
+cid:221 eyr:2040 pid:358648642 hcl:#733820
+
+hgt:181cm cid:295 ecl:blu eyr:2027
+iyr:2016
+byr:1932
+hcl:#2502ba
+pid:177357899
+
+pid:154588649 eyr:2028
+byr:1945 iyr:2020
+ecl:amb cid:220
+hgt:189cm hcl:#a97842
+
+iyr:2011
+eyr:2030 cid:143 byr:1998 pid:403108989
+ecl:oth hcl:#6b5442
+hgt:151cm
+
+pid:071042426 cid:217 iyr:2017 ecl:grn byr:1989 eyr:2026 hgt:193cm hcl:#7d3b0c
+
+eyr:2025
+iyr:2025 pid:3942412883 hcl:#cfa07d cid:237 ecl:utc hgt:182
+
+iyr:2012 eyr:1982 byr:2029 pid:8573047090
+hgt:159in ecl:#1e0124 hcl:#b6652a
+
+hcl:53c64f ecl:gmt iyr:1984 byr:2029
+hgt:59cm
+pid:#106076 eyr:2031
+
+hcl:#733820 iyr:2019
+eyr:2031
+pid:706963298
+hgt:134
+byr:2004
+
+byr:2012 cid:161
+eyr:2039 ecl:gry hgt:61cm iyr:1949 pid:870113802 hcl:z
+
+byr:1961 eyr:2023 pid:353075198 iyr:2020 hcl:#888785 ecl:oth
+hgt:163cm
+
+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
+EOF
diff --git a/Advent-of-Code-2020/AOC-4/main.c b/Advent-of-Code-2020/AOC-4/main.c
new file mode 100644
index 0000000..895dd00
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-4/main.c
@@ -0,0 +1,140 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#if 0
+#define PART_1
+#else
+#define PART_2
+#endif
+
+#if 0
+#define FILE_PATH "example-valid.txt"
+#else
+#define FILE_PATH "input.txt"
+#endif
+
+char fields[8][4] = {"byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid", "cid"};
+
+size_t valid = 0;
+
+void parse()
+{
+    FILE *fp = fopen(FILE_PATH, "r");
+    if(!fp) {
+        fprintf(stderr, "ERROR: Could not open file: %s", FILE_PATH);
+        exit(EXIT_FAILURE);
+    }
+
+    char line[2048] = {0};
+    int field_valid[8] = {0};
+    while(fgets(line, sizeof(line), fp) != NULL)
+    {
+        if(line[0] == '\n' || strncmp(line, "EOF", 3) == 0)
+        {
+            int result = 1;
+            for(int i = 0; i < 7; i++)
+                result *= field_valid[i];
+
+            valid += result;
+            memset(field_valid, 0 , sizeof(field_valid));
+            continue;
+        }
+
+        char *tok = strtok(line, " ");
+        while(tok != NULL)
+        {
+            for(int i = 0; i < 8; i++)
+            {
+                if(strncmp(tok, fields[i], 3) == 0)
+                {
+                    #ifdef PART_1
+                    field_valid[i] = 1;
+                    #endif
+
+                    #ifdef PART_2
+
+                    char *saveptr;
+                    (void)strtok_r(tok, ":", &saveptr);
+                    char *val = strtok_r(NULL, ":", &saveptr);
+                    assert(val != NULL);
+                    assert(strtok_r(NULL, ":", &saveptr) == NULL);
+
+                    if(val[strlen(val)-1] == '\n') val[strlen(val)-1] = '\0';
+
+                    int ival;
+                    switch(i)
+                    {
+                    case 0: ival = atoi(val);
+                        if(ival >= 1920 && ival <= 2002) field_valid[i] = 1;
+                        break;
+                    case 1: ival = atoi(val);
+                        if(ival >= 2010 && ival <= 2020) field_valid[i] = 1;
+                        break;
+                    case 2: ival = atoi(val);
+                        if(ival >= 2020 && ival <= 2030) field_valid[i] = 1;
+                        break;
+                    case 3:
+                        if(strlen(val) == 5)
+                        {
+                            if(!(val[3] == 'c' && val[4] == 'm')) break;
+                            char _val[4] = {0}; _val[0] = val[0];
+                            _val[1] = val[1]; _val[2] = val[2];
+                            ival = atoi(_val);
+                            if(ival >= 150 && ival <= 193) field_valid[i] = 1;
+                        }
+                        if(strlen(val) == 4)
+                        {
+                            if(!(val[2] == 'i' && val[3] == 'n')) break;
+                            char _val[3] = {0}; _val[0] = val[0]; _val[1] = val[1];
+                            ival = atoi(_val);
+
+                            if(ival >= 59 && ival <= 76) field_valid[i] = 1;
+                        }
+
+                        break;
+                    case 4:
+                        int num = 0;
+                        char valid_vals[16] = "0123456789abcdef";
+                        for(int k = 1; k <= strlen(val); k++)
+                            for(int j = 0; j < 16; j++)
+                                if(val[k] == valid_vals[j]) num++;
+
+                        if(val[0] == '#' && num == 6) field_valid[i] = 1;
+                        break;
+                    case 5:
+                        int valid_ecl = 0;
+                        char valid_cols[7][4] = {"amb", "blu", "brn", "gry", "grn", "hzl", "oth"};
+                        for(int k = 0; k < 7; k++)
+                            if(strncmp(val, valid_cols[k], 3) == 0) valid_ecl++;
+
+                        if(valid_ecl == 1) field_valid[i] = 1;
+                        break;
+                    case 6:
+                        int valid_pid = 0;
+                        if(strlen(val) != 9) break;
+                        char valid_nums[10] = "0123456789";
+                        for(int k = 0; k < strlen(val); k++)
+                            for(int j = 0; j < 10; j++)
+                                if(val[k] == valid_nums[j]) valid_pid++;
+
+                        if(valid_pid == 9) field_valid[i] = 1;
+                        break;
+                    }
+                    #endif
+                }
+            }
+            tok = strtok(NULL, " ");
+        }
+    }
+
+    fclose(fp);
+}
+
+int main(void)
+{
+    parse();
+    printf("%ld passports are valid\n", valid);
+    return 0;
+}
diff --git a/Advent-of-Code-2020/AOC-5/build.sh b/Advent-of-Code-2020/AOC-5/build.sh
new file mode 100755
index 0000000..6be9241
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-5/build.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -xe
+
+gcc -o main -Wall -Wextra main.c
+
+./main
diff --git a/Advent-of-Code-2020/AOC-5/example.txt b/Advent-of-Code-2020/AOC-5/example.txt
new file mode 100644
index 0000000..6b89eb8
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-5/example.txt
@@ -0,0 +1,4 @@
+FBFBBFFRLR
+BFFFBBFRRR
+FFFBBBFRRR
+BBFFBBFRLL
diff --git a/Advent-of-Code-2020/AOC-5/input.txt b/Advent-of-Code-2020/AOC-5/input.txt
new file mode 100644
index 0000000..bf62729
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-5/input.txt
@@ -0,0 +1,908 @@
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+FBBFBFFLRR
+FBBBBBFRRL
diff --git a/Advent-of-Code-2020/AOC-5/main.c b/Advent-of-Code-2020/AOC-5/main.c
new file mode 100644
index 0000000..2634753
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-5/main.c
@@ -0,0 +1,137 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#if 0
+#define PART_1
+#else
+#define PART_2
+#endif
+
+#if 0
+#define FILE_PATH "example.txt"
+#define IDS 4
+#else
+#define FILE_PATH "input.txt"
+#define IDS 908
+#endif
+
+#define LOWER(min, max) ((max) - (((max) - (min))/2 + 1))
+#define UPPER(min, max) (((min) + (max))/2 + 1)
+
+#define ROWS  128
+#define COLUMNS 8
+
+int highest_id = 0;
+int ids[IDS] = {0};
+
+void process_pass(char *pass, int index)
+{
+    int min_r = 0; int max_r = ROWS - 1;
+    int min_c = 0; int max_c = COLUMNS - 1;
+
+    for(int i = 0; i < 10; i++)
+    {
+        switch(pass[i])
+        {
+        case 'F':
+            max_r = LOWER(min_r, max_r);
+            break;
+        case 'B':
+            min_r = UPPER(min_r, max_r);
+            break;
+        case 'L':
+            max_c = LOWER(min_c, max_c);
+            break;
+        case 'R':
+            min_c = UPPER(min_c, max_c);
+            break;
+        }
+    }
+
+    int id = min_r * 8 + min_c;
+
+#ifdef PART_1
+    (void)index;
+    if(id > highest_id) highest_id = id;
+#endif
+
+#ifdef PART_2
+    assert(index < IDS);
+    ids[index] = id;
+#endif
+
+}
+
+void parse()
+{
+    FILE *fp = fopen(FILE_PATH, "r");
+    if(!fp) {
+        fprintf(stderr, "ERROR: Could not open file: %s\n", FILE_PATH);
+        exit(EXIT_FAILURE);
+    }
+
+    int i = 0;
+    char line[256] = {0};
+    while(fgets(line, sizeof(line), fp) != NULL)
+    {
+        if(line[10] == '\n') line[10] = '\0';
+        process_pass(line, i);
+        i++;
+    }
+
+    fclose(fp);
+}
+
+int find_id()
+{
+    int your_seat;
+    int seat_missing;
+
+    for(int i = 0; i < IDS; i++)
+    {
+        your_seat    = -1;
+        seat_missing = 0;
+
+        for(int j = 0; j < IDS; j++)
+        {
+            if(ids[i] == (ids[j] + 2))
+            {
+                your_seat = ids[i] - 1;
+                seat_missing = 1;
+
+                for(int k = 0; k < IDS; k++)
+                    if(your_seat == ids[k]) seat_missing = 0;
+            }
+        }
+
+        if(your_seat!= -1 && seat_missing != 0)
+            return your_seat;
+
+    }
+    return -1;
+}
+
+void part_1()
+{
+    printf("Highest boarding ID is %d\n", highest_id);
+}
+
+void part_2()
+{
+    printf("Your id is: %d\n", find_id());
+}
+
+int main(void)
+{
+    parse();
+
+#ifdef PART_1
+    part_1();
+#endif
+#ifdef PART_2
+    part_2();
+#endif
+
+    return 0;
+}