diff --git a/Makefile b/Makefile index 1d7fdfe..ff463eb 100644 --- a/Makefile +++ b/Makefile @@ -1 +1,22 @@ CXXFLAGS := -std=c++20 -O2 -Wall -Wextra + +sources := $(wildcard *.cc) +progs := $(patsubst %.cc,%,$(sources)) + +.PHONY: all +all: $(progs) + +.PHONY: clean +clean: + rm -f $(progs) $(progs:=_test.txt) + +.PHONY: test +test: $(addprefix test-,$(progs)) + +.PHONY: test-% +test-%: %_test.txt + @test -f $*_output.txt && (diff -u $*_output.txt $<; rm -f $<) + @test -f $*_output.txt || cat $< + +$(progs:=_test.txt): %_test.txt: % + ./$< $*_input.txt > $@ diff --git a/d01.cc b/d01.cc index dbcd88b..1e39ffc 100644 --- a/d01.cc +++ b/d01.cc @@ -3,7 +3,8 @@ #include using namespace std; -int main(int argc, char *argv[]) { +int main(int argc, char *argv[]) +{ if (argc <= 1) return 1; vector numbers; diff --git a/d02.cc b/d02.cc index 78abe94..e6f502f 100644 --- a/d02.cc +++ b/d02.cc @@ -14,7 +14,8 @@ struct commands { int pos; }; -int main(int argc, char *argv[]) { +int main(int argc, char *argv[]) +{ if (argc <= 1) return 1; vector commands; diff --git a/d03.cc b/d03.cc new file mode 100644 index 0000000..3c52fff --- /dev/null +++ b/d03.cc @@ -0,0 +1,89 @@ +#include +#include +#include +using namespace std; + +auto parse_input(char *file) +{ + ifstream input(file); + if (!input.is_open()) exit(1); + + vector parsed; + for (string line; getline(input, line);) { + parsed.push_back(line); + } + return parsed; +} + +// Count the occurences of each bit position +vector count_occurences(vector input) +{ + vector counts(input[0].length(), 0); + for (string line : input) { + for (size_t i = 0; i < line.length(); i++) { + if (line[i] == '1') counts[i]++; + if (line[i] == '0') counts[i]--; + } + } + return counts; +} + +unsigned part1(auto input) +{ + vector counts = count_occurences(input); + + // Convert the counts array into a binary value + unsigned out = 0; + for (int i : counts) { + out <<= 1; + if (i > 0) out += 1; + } + + return out * (out ^ ((1 << counts.size()) - 1)); +} + +unsigned part2(auto input) +{ + size_t pos; + + vector numbers_ox = input; + pos = 0; + while (numbers_ox.size() > 1 && pos < input[0].length()) { + int count = count_occurences(numbers_ox)[pos]; + char bit = (count >= 0) + '0'; + for (size_t i = 0; i < numbers_ox.size(); i++) { + if (numbers_ox[i][pos] != bit) { + numbers_ox.erase(numbers_ox.begin()+i); + i--; + } + } + pos++; + } + unsigned ox = stol(numbers_ox[0], NULL, 2); + + vector numbers_co = input; + pos = 0; + while (numbers_co.size() > 1 && pos < input[0].length()) { + int count = count_occurences(numbers_co)[pos]; + char bit = (count < 0) + '0'; + for (size_t i = 0; i < numbers_co.size(); i++) { + if (numbers_co[i][pos] != bit) { + numbers_co.erase(numbers_co.begin()+i); + i--; + } + } + pos++; + } + unsigned co = stol(numbers_co[0], NULL, 2); + + return ox * co; +} + +int main(int argc, char *argv[]) +{ + if (argc <= 1) return 1; + auto input = parse_input(argv[1]); + + cout << part1(input) << endl; + cout << 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