diff --git a/2020/Makefile b/2020/Makefile
index 4ee74ce..60c4544 100644
--- a/2020/Makefile
+++ b/2020/Makefile
@@ -1,16 +1,22 @@
-day1.out: out/types.o day1.cpp day1.input
-	g++ $(flags) day1.cpp out/types.o -o $@
+day1.out: out/types.o day1.cpp
+	g++-10 -std=c++2a $(flags) day1.cpp out/types.o -o $@
 
-day2.out: out/types.o day2.cpp day2.input
-	g++ $(flags) day2.cpp out/types.o -o $@
+day2.out: out/types.o day2.cpp
+	g++-10 -std=c++2a $(flags) day2.cpp out/types.o -o $@
 
-day3.out: out/types.o day3.cpp day3.input
-	g++ $(flags) day3.cpp out/types.o -o $@
+day3.out: out/types.o day3.cpp
+	g++-10 -std=c++2a $(flags) day3.cpp out/types.o -o $@
+
+day4.out: out/types.o day4.cpp
+	g++-10 -std=c++2a $(flags) day4.cpp out/types.o -o $@
+
+day5.out: out/types.o day5.cpp
+	g++-10 -std=c++2a $(flags) day5.cpp out/types.o -o $@
 
 out/types.o: types.hpp types.cpp
 	mkdir -p out/
-	g++ $(flags) -c types.cpp -o $@
+	g++-10 -std=c++2a $(flags) -c types.cpp -o $@
 
 .PHONY: clean
 clean:
-	rm out/* day*.out
+	rm out/* day*.out day*.output
diff --git a/2020/day4.cpp b/2020/day4.cpp
new file mode 100644
index 0000000..f0c5b78
--- /dev/null
+++ b/2020/day4.cpp
@@ -0,0 +1,114 @@
+/*******************************************************************************
+ *
+ * Copyright (c) 2020 Gnarwhal
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files(the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ *******************************************************************************/
+
+#include <vector>
+#include <string>
+#include <fstream>
+#include <iostream>
+
+#include "types.hpp"
+
+struct KeyValue {
+	std::string key;
+	bool (*func)(const std::string & passport, usize index);
+};
+
+template <usize Min, usize Max>
+auto try_num(const std::string & passport, usize index) -> bool {
+	auto num = usize(0);
+	--index;
+	while (++index < passport.size() && '0' <= passport[index] && passport[index] <= '9') {
+		num = (num * 10) + passport[index] - '0';
+	}
+	return Min <= num && num <= Max;
+};
+
+auto main(i32 argc, char * argv[]) -> i32 {
+	auto valid_count1 = usize(0);
+	auto valid_count2 = usize(0);
+
+	auto passport = std::string();
+	auto line     = std::string();
+	auto file     = std::ifstream("day4.input");
+	while (getline(file, line)) {
+		if (line == "") {
+			auto elements = std::vector<KeyValue>{
+				{ "byr", try_num<1920, 2002> },
+				{ "iyr", try_num<2010, 2020> },
+				{ "eyr", try_num<2020, 2030> },
+				{ "hgt", [](const std::string & passport, usize index) -> bool {
+					return (try_num<150, 193>(passport, index) && passport.find("cm", index + 3) == index + 3)
+						|| (try_num<59,  76 >(passport, index) && passport.find("in", index + 2) == index + 2);
+				}},
+				{ "hcl", [](const std::string & passport, usize index) -> bool {
+					if (index < passport.size() && passport[index] == '#') {
+						auto length = usize(0);
+						auto true_index = usize(0);
+						while ((true_index = index + ++length) < passport.size() && (
+							   ('0' <= passport[true_index] && passport[true_index] <= '9')
+							|| ('a' <= passport[true_index] && passport[true_index] <= 'f')
+							|| ('A' <= passport[true_index] && passport[true_index] <= 'F')
+						));
+						return length == 7;
+					}
+					return false;
+				}},
+				{ "ecl", [](const std::string & passport, usize index) -> bool {
+					const static auto eye_colors = std::vector<std::string>{ "amb", "blu", "brn", "gry", "grn", "hzl", "oth" };
+					auto i = usize(0);
+					for (; i < eye_colors.size() && passport.find(eye_colors[i], index) != index; ++i);
+					return i < eye_colors.size();
+				}},
+				{ "pid", [](const std::string & passport, usize index) -> bool {
+					auto length     = usize(-1);
+					auto true_index = usize( 0);
+					while ((true_index = index + ++length) < passport.size()
+						&& ('0' <= passport[true_index] && passport[true_index] <= '9')
+					);
+					return length == 9;
+				}},
+			};
+			auto valid1 = true;
+			auto valid2 = true;
+			for (auto i = usize(0); i < elements.size() && valid1; ++i) {
+				auto index = usize(0);
+				valid2 =
+					(valid1 = ((index = passport.find(elements[i].key)) != std::string::npos))
+					&& valid2
+					&& elements[i].func(passport, index + elements[i].key.size() + 1);
+			}
+			valid_count1 += valid1;
+			valid_count2 += valid2;
+			passport = "";
+		} else {
+			passport += line + ' ';
+		}
+	}
+
+	std::cout << valid_count1 << ", " << valid_count2 << std::endl;
+	
+	return 0;
+}
diff --git a/2020/day4.input b/2020/day4.input
new file mode 100644
index 0000000..e703e66
--- /dev/null
+++ b/2020/day4.input
@@ -0,0 +1,1147 @@
+byr:1983 iyr:2017
+pid:796082981 cid:129 eyr:2030
+ecl:oth hgt:182cm
+
+iyr:2019
+cid:314
+eyr:2039 hcl:#cfa07d hgt:171cm ecl:#0180ce byr:2006 pid:8204115568
+
+byr:1991 eyr:2022 hcl:#341e13 iyr:2016 pid:729933757 hgt:167cm ecl:gry
+
+hcl:231d64 cid:124 ecl:gmt eyr:2039
+hgt:189in
+pid:#9c3ea1
+
+ecl:#1f58f9
+pid:#758e59
+iyr:2022
+hcl:z
+byr:2016 hgt:68 eyr:1933
+
+hcl:#fffffd ecl:gry eyr:2022
+hgt:172cm pid:781914826 byr:1930 iyr:2018
+
+hcl:#08df7e ecl:grn byr:1942
+eyr:2028 iyr:2011 cid:141 pid:319110455
+hgt:186cm
+
+pid:991343040 hgt:179cm
+hcl:#a97842 iyr:2020
+eyr:2024
+byr:1984 cid:181
+
+pid:188cm byr:2005
+hgt:170cm cid:163 ecl:#a08502 hcl:2964fb eyr:1994
+iyr:2005
+
+ecl:grn hcl:#fffffd iyr:2013
+pid:705547886
+byr:1928 hgt:168cm eyr:2030
+
+cid:219
+pid:016251942 hcl:#602927 hgt:163cm
+byr:1943 eyr:2029 ecl:oth iyr:2019
+
+ecl:gry hgt:184cm eyr:2026
+iyr:2010
+pid:117647952 hcl:#efcc98
+byr:1942
+
+cid:243 hcl:#888785 ecl:blu eyr:2027 pid:362697676
+iyr:2011 byr:1962 hgt:154cm
+
+hgt:154cm byr:1965 ecl:blu eyr:2030
+pid:779104554 iyr:2016 hcl:#435634
+
+hcl:z eyr:1996 iyr:1993
+pid:#50f768
+ecl:zzz hgt:62cm byr:2017
+
+ecl:grn byr:1988 iyr:2016
+hgt:167cm
+hcl:#cfa07d
+eyr:2030 pid:951967790
+
+pid:320348494 iyr:2018 cid:281
+byr:2004
+hcl:#06a58b
+eyr:2033
+ecl:zzz
+hgt:76cm
+
+cid:83 ecl:brn eyr:2028
+byr:1941 iyr:2016
+hcl:#341e13 pid:806979833
+hgt:179cm
+
+ecl:brn
+byr:1982 iyr:2010 eyr:2029 pid:535752324 hcl:#efcc98
+
+ecl:oth
+hgt:70in hcl:#866857 eyr:2025 pid:203320330 iyr:2018 byr:2000
+
+hgt:70cm byr:2015 pid:#218eb5 hcl:#0ec4fe iyr:2014 cid:228 ecl:#c8533a
+eyr:2035
+
+hcl:#6b5442
+eyr:2020 ecl:hzl iyr:2017 hgt:173cm
+cid:330 byr:1988 pid:173148327
+
+iyr:2011 byr:1964 hgt:83 ecl:grn hcl:#c0946f pid:931162400 eyr:2028
+
+cid:239
+byr:1960 ecl:hzl
+hgt:164cm
+hcl:#51040b iyr:2018 eyr:2025
+
+cid:163 hgt:154cm
+iyr:2015 eyr:2027 pid:838964596
+byr:1972 ecl:oth hcl:#efcc98
+
+hgt:181cm
+eyr:2028 ecl:blu
+pid:853714682 hcl:#623a2f byr:1976 iyr:2020
+
+cid:225 byr:1957
+hcl:#a97842 iyr:2013 eyr:2025
+pid:511588647 hgt:173cm ecl:blu
+
+hcl:#efcc98
+byr:1993
+ecl:oth
+pid:871652492 eyr:2028 hgt:177cm iyr:2016
+cid:220
+
+ecl:hzl
+hgt:165cm
+hcl:#733820 eyr:2028 cid:57 byr:1973 iyr:2018 pid:018982018
+
+pid:491710153 iyr:2012 ecl:#c85046 hcl:#b6652a
+eyr:2040 hgt:175cm byr:1981
+
+pid:917105765 eyr:2021 hgt:181cm iyr:2019 cid:159 byr:1995
+ecl:gry
+
+hcl:#9d2ec4 iyr:2011
+eyr:2028 pid:149288934 hgt:63in ecl:blu byr:1960
+
+byr:1923 pid:705818464 eyr:2024 cid:221 ecl:oth hcl:#7d3b0c hgt:193cm iyr:2014
+
+pid:117111015 eyr:2030
+byr:1967 hcl:#ceb3a1 ecl:blu
+hgt:157cm
+iyr:2011
+
+iyr:2019 ecl:oth
+hcl:#fffffd hgt:172cm pid:215010680
+eyr:2025
+
+pid:157cm cid:277
+iyr:1976 hgt:159in hcl:#341e13 ecl:#6c7644 eyr:2029 byr:1965
+
+pid:787186482 ecl:brn
+byr:1980 hcl:#f5dfb9 eyr:2020
+iyr:2018 hgt:188cm
+
+cid:168
+eyr:2023 hcl:#07c809
+iyr:2013
+hgt:169cm pid:250679100 byr:1945 ecl:gry
+
+hcl:#6b5442 pid:683134187 iyr:2013 eyr:2023 byr:1965 hgt:171cm ecl:hzl
+
+eyr:2028 hgt:180cm ecl:blu byr:1952 cid:314 iyr:2016
+pid:720794393 hcl:#602927
+
+byr:1982 iyr:2016
+ecl:brn eyr:2027
+hgt:156cm pid:185583837 hcl:#ddbf30
+
+hcl:#ceb3a1 pid:987624973
+eyr:2026
+iyr:2013 byr:1988 hgt:175cm ecl:grn
+
+eyr:2028 byr:1974 pid:350988773 hcl:#a97842 iyr:2015
+ecl:oth
+hgt:160cm
+
+hcl:#b6652a
+eyr:2028
+pid:717504683 byr:1970
+iyr:2013
+ecl:gry
+hgt:156cm
+
+pid:453874703 iyr:2015 hcl:#a97842 ecl:hzl byr:1986 hgt:175cm cid:132 eyr:2025
+
+hcl:#7d3b0c
+eyr:2026
+ecl:brn hgt:154cm
+byr:1959 pid:580659686 iyr:2015
+
+ecl:amb hgt:191cm iyr:2018
+pid:681417707 byr:1994 eyr:2023 hcl:#c0946f
+
+eyr:2022 pid:302326561 iyr:2018 ecl:blu byr:1987 cid:89 hcl:#a97842 hgt:184cm
+
+eyr:2020 pid:457081226
+ecl:blu hcl:#866857 iyr:2011
+hgt:159cm byr:1959
+
+eyr:2024 cid:322 byr:1991 pid:210415503
+hgt:69in ecl:grn
+hcl:#623a2f
+
+ecl:blu iyr:2012 pid:524745721 hcl:#c0946f eyr:2026 hgt:176cm byr:1964
+
+hgt:189cm iyr:2014 pid:679155617 hcl:#efcc98 eyr:2027
+cid:88 byr:1974
+ecl:blu
+
+byr:1935 eyr:2029
+iyr:2020
+hcl:#733820 ecl:blu hgt:190cm pid:509009432
+
+hcl:#fffffd pid:446558583 byr:1931 ecl:brn iyr:2019
+hgt:159cm cid:146
+eyr:2024
+
+eyr:2028 hcl:#efcc98 pid:330588516 hgt:65cm
+byr:1972 iyr:2014 ecl:oth
+
+ecl:blu hgt:175cm cid:197 pid:068138358 eyr:2023 iyr:2017 hcl:#0441c6 byr:1999
+
+byr:1992 hgt:193cm
+ecl:brn iyr:2018 hcl:#866857 pid:905992465
+eyr:2022
+
+hgt:95 byr:1965
+pid:810311252 eyr:2034 hcl:z iyr:1985 cid:254
+
+hcl:#c0946f byr:1985 eyr:2030 hgt:161cm iyr:2010 ecl:gry pid:616639221
+
+iyr:2011 eyr:2023 hgt:172cm cid:260 ecl:hzl
+pid:594747312
+hcl:#a97842 byr:1937
+
+eyr:2028 pid:134536806 cid:83
+ecl:brn byr:1928
+iyr:2015
+hcl:#fffffd hgt:157cm
+
+iyr:2016
+pid:035433923 hgt:180cm ecl:amb eyr:2027 byr:1934
+cid:195 hcl:#583d02
+
+eyr:1936 cid:130 byr:1969 hgt:74cm hcl:50e1a7 ecl:gmt iyr:2010 pid:82008848
+
+hcl:#733820
+eyr:2020
+hgt:174cm iyr:2018 ecl:hzl byr:1983 pid:087167304
+
+byr:1972 hcl:#888785 eyr:2020 pid:593301831 iyr:2013 ecl:hzl hgt:188cm
+
+cid:282 hcl:#888785 hgt:170cm ecl:oth eyr:2029
+byr:1942 pid:014356555 iyr:2020
+
+byr:1966 hcl:#623a2f ecl:oth hgt:165cm
+eyr:2028 iyr:2012 pid:558908746
+
+pid:#4f5b92
+hcl:#6b5442 hgt:188cm
+byr:1994 iyr:2014 cid:127 eyr:2020
+ecl:oth
+
+hgt:153cm
+ecl:brn iyr:2020
+eyr:2026 hcl:#18171d
+pid:101990935
+byr:1932
+
+iyr:2011 byr:1981 hgt:157cm hcl:#c0946f
+eyr:2029 pid:545992967
+ecl:utc
+
+byr:1929 hcl:#602927 iyr:2018 ecl:grn
+eyr:2027
+pid:256056759
+hgt:178cm
+
+iyr:2016 pid:813526512 eyr:2027 hcl:#20799c
+ecl:blu
+byr:1971 hgt:185cm
+
+iyr:2021 eyr:2040
+pid:5135078781 byr:2013 hcl:#7d3b0c hgt:62cm ecl:#dedf53
+
+iyr:2013
+byr:1979 cid:269 hgt:179cm pid:871628606 eyr:2026 hcl:#53b66c
+ecl:grn
+
+eyr:2020
+hcl:#ceb3a1 byr:1988 ecl:oth iyr:2012
+pid:558371571
+
+pid:908462345 byr:1972 hgt:183cm ecl:gry cid:51 hcl:#af82df eyr:2023 iyr:2019
+
+pid:106942710 ecl:hzl
+hgt:157cm hcl:z eyr:2025 iyr:2016
+byr:1998 cid:271
+
+iyr:2011 ecl:oth pid:191542220
+byr:1951 eyr:2027 hcl:#c0946f hgt:190cm
+
+eyr:2028 hgt:193cm pid:235913726 iyr:2012 hcl:#325350
+ecl:amb
+
+iyr:2018 hcl:#a97842 ecl:hzl byr:1988 pid:481250123
+cid:328 hgt:165cm eyr:2028
+
+ecl:#a51d9c hcl:91236c pid:2538922220 byr:2017 eyr:2004
+iyr:2026 hgt:174
+
+pid:959660262 eyr:2022 cid:339 hgt:170cm iyr:2012
+hcl:#cfa07d ecl:brn
+
+hcl:#866857
+ecl:dne hgt:70cm eyr:2013 iyr:1980 pid:780067045
+byr:1950
+
+iyr:2011
+byr:1981
+pid:902964474 ecl:gry eyr:2021
+hgt:154cm
+hcl:#602927 cid:156
+
+iyr:2016
+hgt:156cm ecl:brn cid:315 eyr:2023 byr:1997
+hcl:#623a2f pid:339892714
+
+ecl:brn hgt:73in cid:184 byr:1960 eyr:2024 iyr:2014 hcl:#888785
+pid:561655785
+
+pid:579663338
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+hcl:#ceb3a1 ecl:grt hgt:188cm
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+
+byr:1941 eyr:2029 pid:252436521
+hgt:170cm ecl:hzl
+
+hcl:#888785
+pid:378073052
+hgt:185cm
+cid:343 byr:2001
+ecl:oth iyr:1988 eyr:2029
+
+pid:286459107 byr:1973 eyr:2023 ecl:oth cid:273
+hgt:184cm
+
+pid:406853460 eyr:2028 hcl:#b6652a
+hgt:179cm
+iyr:2020 cid:346
+ecl:brn byr:1973
+
+hcl:#ceb3a1 eyr:2026 pid:001798001 ecl:gry hgt:157cm
+cid:235
+byr:1968
+iyr:2013
+
+hcl:#b6652a hgt:151cm pid:504383643 iyr:2018
+ecl:brn byr:1990
+eyr:2021
+
+hgt:164cm iyr:2015 hcl:#888785 byr:1998 pid:045813631 cid:237
+ecl:grn
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+
+hcl:#733820 hgt:172cm
+eyr:2030 iyr:2015 ecl:gry pid:507769390 byr:1979 cid:212
+
+cid:138 hgt:176cm hcl:#efcc98
+eyr:2024 byr:1984
+ecl:brn iyr:2015 pid:968062470
+
+hcl:#733820 iyr:2015 ecl:oth
+eyr:2028 pid:431922630 hgt:160cm byr:1941
+
+iyr:2017
+eyr:2023 ecl:grn cid:294 byr:1969
+hcl:#602927 pid:720065302
+hgt:67in
+
+ecl:gry byr:2002 eyr:2024 hcl:#7d3b0c
+hgt:174cm
+iyr:2012 pid:296913847
+
+pid:42057861 hcl:bb7ace eyr:2023 byr:2013 hgt:188 ecl:#312118 iyr:2024
+
+eyr:2021
+byr:1958
+hgt:170cm ecl:brn iyr:2012
+pid:064919306 cid:349 hcl:#602927
+
+eyr:2022
+pid:248168906
+iyr:2013 byr:1996 hcl:#cfa07d
+hgt:151cm ecl:hzl
+
+cid:301 ecl:brn hcl:#fffffd
+hgt:183cm
+pid:806659387
+eyr:2021
+byr:1970 iyr:2013
+
+cid:192
+iyr:2013
+ecl:#5ad460 hgt:64cm
+pid:001255475 byr:1984 eyr:2027 hcl:#cfa07d
+
+iyr:2012 pid:194936105 eyr:2028 byr:2000 ecl:oth hcl:#733820 hgt:158cm
+
+cid:323
+hcl:#a97842 eyr:2027 pid:625573908
+iyr:2019 byr:1987 ecl:grn
+hgt:191cm
+
+pid:997956152 hgt:193cm ecl:hzl eyr:2024 byr:1983
+cid:113 hcl:#888785
+iyr:2013
+
+iyr:2017 hgt:153cm hcl:#733820 byr:1984 eyr:2025 pid:138608494 ecl:blu
+
+ecl:brn
+byr:1987 hgt:174cm
+iyr:2013 pid:459148475 eyr:2023 hcl:#623a2f cid:266
+
+byr:2000 iyr:2017 ecl:brn pid:469155516 hcl:#b6652a
+eyr:2027 hgt:193cm
+
+byr:1967 eyr:2028 pid:064940030
+iyr:2016
+ecl:gry hcl:#18171d hgt:74in
+
+iyr:2020 hcl:#efcc98
+byr:1968 hgt:164cm ecl:hzl pid:834180009 eyr:2022
+
+pid:021397352
+iyr:2018 hcl:#341e13 byr:1978 eyr:2022 ecl:oth hgt:67in
+
+hgt:160cm cid:213 ecl:#a46ef7 pid:157cm eyr:2020 iyr:2020 byr:1923
+
+iyr:2016
+cid:235 pid:454188395 eyr:2022 hgt:73in ecl:hzl
+hcl:#7d3b0c byr:1964
+
+iyr:1930 eyr:2033 hgt:76cm pid:41117341 byr:2028 ecl:utc
+hcl:#6b5442
+
+pid:41316572
+hcl:#cfa07d byr:1965 eyr:2027 hgt:179cm iyr:2010
+ecl:grn
+
+hgt:152cm pid:886168412 iyr:2027
+eyr:1989 hcl:9993d6 byr:2005 ecl:zzz
+
+pid:661569613 hgt:166cm
+hcl:#18171d iyr:2010 byr:1922 eyr:2030 ecl:brn
+
+byr:1958
+ecl:blu pid:978855125
+eyr:2020 iyr:2019
+hgt:190cm hcl:#18171d
+
+hgt:68in iyr:2012 hcl:#ceb3a1 eyr:2028 ecl:oth pid:067088299
+byr:1975
+
+eyr:2020
+pid:507464869 hcl:#fffffd hgt:156cm iyr:2016
+byr:1957 ecl:blu
+
+cid:259 eyr:2025 byr:1954
+ecl:gry hgt:167cm pid:832017347 iyr:2020 hcl:#623a2f
+
+hgt:69in hcl:#a97842
+pid:426496916 byr:1947 eyr:2021 iyr:2015 ecl:oth
+
+eyr:2025 ecl:blu pid:543125976 cid:192 iyr:2017
+byr:1920 hgt:154cm hcl:#a7ecdc
+
+hgt:69in iyr:2017
+byr:1932 hcl:#6b5442
+ecl:hzl cid:349 pid:494399909 eyr:2029
+
+eyr:2030 ecl:gry hcl:#6b5442
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diff --git a/2020/day4.output b/2020/day4.output
new file mode 100644
index 0000000..a08d9f1
--- /dev/null
+++ b/2020/day4.output
@@ -0,0 +1,9 @@
+1
+1
+1
+1
+0
+0
+0
+5: 0
+1, 0
diff --git a/2020/day5.cpp b/2020/day5.cpp
new file mode 100644
index 0000000..04d1606
--- /dev/null
+++ b/2020/day5.cpp
@@ -0,0 +1,67 @@
+/*******************************************************************************
+ *
+ * Copyright (c) 2020 Gnarwhal
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files(the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ *******************************************************************************/
+
+#include <vector>
+#include <algorithm>
+#include <string>
+#include <iostream>
+#include <fstream>
+
+#include "types.hpp"
+
+auto main(i32 argc, char * argv[]) -> i32 {
+	auto seat = usize(0);
+	auto line = std::string();
+	auto file = std::ifstream("day5.input");
+
+	auto seats = std::vector<usize>();
+
+	while (getline(file, line)) {
+		auto local_seat = usize(0);
+		for (auto i = usize(0); i < 7 + 3; ++i) {
+			local_seat <<= 1;
+			if (line[i] == 'B' || line[i] == 'R') {
+				local_seat |= 1;
+			}
+		}
+		if (local_seat > seat) {
+			seat = local_seat;
+		}
+		seats.push_back(local_seat);
+	}
+	std::cout << seat << std::endl;
+
+	std::sort(seats.begin(), seats.end());
+
+	for (auto i = usize(0); i < seats.size() - 1; ++i) {
+		if (seats[i] + 2 == seats[i + 1]) {
+			std::cout << (seats[i] + 1) << std::endl;
+			break;
+		}
+	}
+
+	return 0;
+}
diff --git a/2020/day5.input b/2020/day5.input
new file mode 100644
index 0000000..4ed7747
--- /dev/null
+++ b/2020/day5.input
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