5 files changed, 1110 insertions, 0 deletions
diff --git a/day03/day03 b/day03/day03
new file mode 100755
index 0000000..ccb1732
--- /dev/null
+++ b/day03/day03
diff --git a/day03/day03.cpp b/day03/day03.cpp
new file mode 100644
index 0000000..036cd07
--- /dev/null
+++ b/day03/day03.cpp
@@ -0,0 +1,96 @@
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+
+int bin_to_dec (std::string bin) {
+	int dec = 0, pow = 1;
+	for (std::size_t i=bin.size(); i > 0; i--) {
+		dec += pow * (bin[i-1] == '0' ? 0 : 1);
+		pow *= 2;
+	}
+	return dec;
+}
+
+std::vector<int> get_freq (std::vector<std::string> bits) { 
+	std::vector<int> freq;
+	for (std::size_t i=0; i<bits[0].size(); i++) {
+		freq.push_back(0);
+	}
+
+	for (auto b : bits) {
+		for (std::size_t i=0; i< b.size(); i++) {
+		 	freq[i] += (b[i] == '0' ? 0 : 1)*2-1;
+		}
+	}
+	return freq;
+}
+
+std::vector<std::string> filter (std::vector<std::string> bits, int inv, int sel) {
+	std::vector<std::string> res;
+	auto freq = get_freq(bits);
+
+	for (auto b : bits) {
+		int f = freq[sel] * inv;
+		if (f == 0) f += inv;
+		if ((f > 0 ? '0' : '1') == b[sel]) {
+			res.push_back(b);
+		}
+	}
+
+	return res;
+}
+
+int main (int argc, char *argv[]) {
+	if (argc != 2) return 1;
+
+	std::string raw;
+	std::getline(std::ifstream(argv[1]), raw, '\0');
+
+	std::vector<std::string> bits;	
+
+	while (1) {
+		auto token = raw.find("\n");
+		if (token != std::string::npos) {
+			bits.push_back(raw.substr(0, token));
+			raw = raw.substr(token+1);
+		} else {
+			if (raw.size() > 0) bits.push_back(raw);
+			break;
+		}
+	}
+
+	auto freq = get_freq(bits);
+
+	std::string gamma = "", epsilon = "";
+	for (std::size_t i=0; i<freq.size(); i++) {
+		gamma += freq[i] > 0 ? "1" : "0";
+		epsilon += freq[i] > 0 ? "0" : "1";
+	}
+
+	int g = bin_to_dec(gamma);
+	int e = bin_to_dec(epsilon);
+	std::cout << "power level " << e*g << ", "
+   		<< "epsilon " << e << " (" << epsilon << "), "
+		<< "gamma " << g << " (" << gamma << ")" << std::endl;
+
+	std::vector<std::string> o2 = bits;
+	for (std::size_t i=0; i<freq.size(); i++) {
+		o2 = filter(o2, 1, i);
+		if (o2.size() == 1) break;
+	}
+
+	std::vector<std::string> co2 = bits;
+	for (std::size_t i=0; i<freq.size(); i++) {
+		co2 = filter(co2, -1, i);
+		if (co2.size() == 1) break;
+	}
+
+	int generator = bin_to_dec(o2[0]);
+	int scrubber = bin_to_dec(co2[0]);
+	std::cout << "oxigen generator rating " << scrubber*generator << ", "
+   		<< "epsilon " << generator << " (" << o2[0] << "), "
+		<< "gamma " << scrubber << " (" << co2[0] << ")" << std::endl;
+
+	return 0;
+}
diff --git a/day03/day03_input.txt b/day03/day03_input.txt
new file mode 100644
index 0000000..ac22a69
--- /dev/null
+++ b/day03/day03_input.txt
@@ -0,0 +1,1000 @@
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+001010100101
+101010001100
+011100001011
+000101001111
+010010101111
+101000111011
+001101000001
+100100100001
+100010101111
+100111111110
+011011111001
+101000000001
+111001101101
+101011010101
+111111100110
+001010010100
+011101111001
+001100100000
+101001110110
diff --git a/day03/day03_input_ez.txt b/day03/day03_input_ez.txt
new file mode 100644
index 0000000..a6366a8
--- /dev/null
+++ b/day03/day03_input_ez.txt
@@ -0,0 +1,12 @@
+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010
diff --git a/day03/makefile b/day03/makefile
new file mode 100644
index 0000000..7c21cf0
--- /dev/null
+++ b/day03/makefile
@@ -0,0 +1,2 @@
+all day03.cpp:
+	g++ -std=c++20 -o day03 day03.cpp