From fb54beb2bef7fe6b0d4e524b03c61d3f94ffee09 Mon Sep 17 00:00:00 2001
From: jacopograndi <jacopo.grandi@outlook.it>
Date: Thu, 6 Jan 2022 13:05:05 +0100
Subject: init

---
 day01/day01              |  Bin 0 -> 79296 bytes
 day01/day01.cpp          |   52 ++
 day01/day01_input.txt    | 2000 ++++++++++++++++++++++++++++++++++++++++++++++
 day01/day01_input_ez.txt |   10 +
 day01/makefile           |    2 +
 day02/day02              |  Bin 0 -> 47672 bytes
 day02/day02.cpp          |   50 ++
 day02/day02_input.txt    | 1000 +++++++++++++++++++++++
 day02/makefile           |    2 +
 day03/day03              |  Bin 0 -> 83112 bytes
 day03/day03.cpp          |   96 +++
 day03/day03_input.txt    | 1000 +++++++++++++++++++++++
 day03/day03_input_ez.txt |   12 +
 day03/makefile           |    2 +
 day04/day04              |  Bin 0 -> 116280 bytes
 day04/day04.cpp          |  134 ++++
 day04/day04_input.txt    |  601 ++++++++++++++
 day04/day04_input_ez.txt |   19 +
 day04/makefile           |    2 +
 19 files changed, 4982 insertions(+)
 create mode 100755 day01/day01
 create mode 100644 day01/day01.cpp
 create mode 100644 day01/day01_input.txt
 create mode 100644 day01/day01_input_ez.txt
 create mode 100644 day01/makefile
 create mode 100755 day02/day02
 create mode 100644 day02/day02.cpp
 create mode 100644 day02/day02_input.txt
 create mode 100644 day02/makefile
 create mode 100755 day03/day03
 create mode 100644 day03/day03.cpp
 create mode 100644 day03/day03_input.txt
 create mode 100644 day03/day03_input_ez.txt
 create mode 100644 day03/makefile
 create mode 100755 day04/day04
 create mode 100644 day04/day04.cpp
 create mode 100644 day04/day04_input.txt
 create mode 100644 day04/day04_input_ez.txt
 create mode 100644 day04/makefile

diff --git a/day01/day01 b/day01/day01
new file mode 100755
index 0000000..8fb500a
Binary files /dev/null and b/day01/day01 differ
diff --git a/day01/day01.cpp b/day01/day01.cpp
new file mode 100644
index 0000000..113f86d
--- /dev/null
+++ b/day01/day01.cpp
@@ -0,0 +1,52 @@
+#include <iostream>
+#include <string>
+#include <vector> 
+#include <algorithm> 
+
+std::string read (char* name) {
+	FILE *f = fopen(name, "r");
+	char c = fgetc(f); std::string txt;
+	while (c != EOF) { txt += c; c = fgetc(f); }
+	fclose(f);
+	return txt;
+}
+
+std::vector<std::string> split (std::vector<std::string> vec, std::string name) {
+	auto token = name.find("\n");
+	if (token != std::string::npos) {
+		vec.push_back(name.substr(0, token));
+		return split(vec, name.substr(token+1));
+	} else if (name.size() > 1) { 
+		vec.push_back(name);
+	}
+	return vec;
+}
+
+int main (int argc, char* argv[]) {
+	if (argc < 2 && argc > 3) return 1;
+	std::string txt = read(argv[1]);
+
+	std::vector<std::string> vec;
+	vec = split(vec, txt);
+	std::vector<int> depths;
+	for (auto v : vec) {
+		depths.push_back(std::stoi(v));
+	}
+
+	int window = 1;
+	if (argc == 3) { window = atoi(argv[2]); }
+
+	int inc = 0;
+	for (std::size_t i=0; i<depths.size(); i++) {
+		if (i >= window) {
+			int sum0 = 0, sum1 = 0;
+			for (int j=0; j<window; j++) sum0 += depths[i-j-1];
+			for (int j=0; j<window; j++) sum1 += depths[i-j];
+			if (sum1 > sum0) inc ++;
+		}
+	}
+
+	std::cout << "The number of depth increases is " << inc << std::endl;
+
+	return 0;
+}
diff --git a/day01/day01_input.txt b/day01/day01_input.txt
new file mode 100644
index 0000000..b3ee114
--- /dev/null
+++ b/day01/day01_input.txt
@@ -0,0 +1,2000 @@
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diff --git a/day01/day01_input_ez.txt b/day01/day01_input_ez.txt
new file mode 100644
index 0000000..167e291
--- /dev/null
+++ b/day01/day01_input_ez.txt
@@ -0,0 +1,10 @@
+199
+200
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+210
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+269
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+263
diff --git a/day01/makefile b/day01/makefile
new file mode 100644
index 0000000..92fb064
--- /dev/null
+++ b/day01/makefile
@@ -0,0 +1,2 @@
+all day01.cpp:
+	g++ -std=c++20 -o day01 day01.cpp
diff --git a/day02/day02 b/day02/day02
new file mode 100755
index 0000000..8755c57
Binary files /dev/null and b/day02/day02 differ
diff --git a/day02/day02.cpp b/day02/day02.cpp
new file mode 100644
index 0000000..dccb44a
--- /dev/null
+++ b/day02/day02.cpp
@@ -0,0 +1,50 @@
+#include <iostream>
+
+int main (int argc, char *argv[]) {
+	if (argc != 2) return 1;
+	
+	int depth = 0;
+   	int	forward = 0;
+
+	int aim = 0;
+	int aim_depth = 0;
+
+	FILE *f = fopen(argv[1], "r");
+	char c = fgetc(f); 
+	std::string command;
+	while (c != EOF) {
+		if (c == '\n') {
+			auto token_space = command.find(" ");
+			if (token_space != std::string::npos) {
+				std::string op = command.substr(0, token_space);
+				int amt = std::stoi(command.substr(token_space+1));
+				if (op == "forward") {
+					forward += amt;
+					aim_depth += aim * amt;
+				}
+				if (op == "down") {
+					depth += amt;
+					aim += amt;
+				}
+				if (op == "up") {
+					depth -= amt;
+					aim -= amt;
+				}
+			} 
+			command = "";
+		}
+		else command += c;
+		c = fgetc(f);
+	}
+
+	std::cout << "depth " << depth << ", "
+		<< "forward " << forward << ", "
+		<< "product " << depth * forward << std::endl;
+
+	std::cout << "using aim: depth " << aim_depth << ", "
+		<< "forward " << forward << ", "
+		<< "aim " << aim << ", "
+		<< "product " << aim_depth * forward << std::endl;
+
+	return 0;
+}
diff --git a/day02/day02_input.txt b/day02/day02_input.txt
new file mode 100644
index 0000000..7834464
--- /dev/null
+++ b/day02/day02_input.txt
@@ -0,0 +1,1000 @@
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diff --git a/day02/makefile b/day02/makefile
new file mode 100644
index 0000000..61ca2f4
--- /dev/null
+++ b/day02/makefile
@@ -0,0 +1,2 @@
+all day02.cpp:
+	g++ -std=c++20 -o day02 day02.cpp
diff --git a/day03/day03 b/day03/day03
new file mode 100755
index 0000000..ccb1732
Binary files /dev/null and b/day03/day03 differ
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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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
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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
diff --git a/day04/day04 b/day04/day04
new file mode 100755
index 0000000..b28d295
Binary files /dev/null and b/day04/day04 differ
diff --git a/day04/day04.cpp b/day04/day04.cpp
new file mode 100644
index 0000000..7736eff
--- /dev/null
+++ b/day04/day04.cpp
@@ -0,0 +1,134 @@
+#include <iostream>
+#include <fstream>
+#include <vector>
+
+void split (std::vector<std::string> &vec, std::string str, std::string del) {
+	auto token = str.find(del);
+	if (token != std::string::npos) {
+		vec.push_back(str.substr(0, token));
+		split(vec, str.substr(token+del.size()), del);
+	} else { vec.push_back(str); }
+}
+
+class Board {
+	public:
+	Board(std::string repr) { 
+		std::vector<std::string> lines;
+		split(lines, repr, "\n");
+		for (auto line : lines) {
+			std::vector<std::string> strcells;
+			split(strcells, line, " ");
+			size = 0;
+			for (auto strcell : strcells) {
+				if (strcell.size() == 0) continue;
+				cells.push_back(std::stoi(strcell));
+				state.push_back(0);
+				size++;
+			}
+		}
+
+	}
+
+	int size;
+	std::vector<int> cells;
+	std::vector<int> state;
+
+	void mark (int ex) {
+		for (int y=0; y<size; y++) {
+			for (int x=0; x<size; x++) {
+				int i = x + y*size;
+				if (cells[i] == ex) {
+					state[i] = 1;
+				}
+			}
+		}
+	}
+
+	bool win () {
+		for (int y=0; y<size; y++) {
+			int sum_row = 0;
+			for (int x=0; x<size; x++) {
+				int i = x + y*size;
+				sum_row += state[i];
+			}
+			if (sum_row == size) return true;
+		}
+		for (int x=0; x<size; x++) {
+			int sum_col = 0;
+			for (int y=0; y<size; y++) {
+				int i = x + y*size;
+				sum_col += state[i];
+			}
+			if (sum_col == size) return true;
+		}
+		return false;
+	}
+
+	int score () {
+		int sum = 0;
+		for (int y=0; y<size; y++) {
+			for (int x=0; x<size; x++) {
+				int i = x + y*size;
+				if (state[i] == 0) {
+					sum += cells[i];
+				}
+			}
+		}
+		return sum;
+	}
+};
+
+int main (int argc, char *argv[]) {
+	if (argc != 2) return 1;
+	std::string raw;
+	std::getline(std::ifstream(argv[1]), raw, '\0');
+
+	std::vector<int> extract;
+	auto token = raw.find("\n");
+	if (token != std::string::npos) {
+		std::string ex = raw.substr(0, token);
+		std::vector<std::string> vec;
+	   	split(vec, ex, ",");
+		for (auto v : vec) { extract.push_back(std::stoi(v)); }
+
+		raw = raw.substr(token+2);
+		if (raw[raw.size()-1] == '\n') raw = raw.substr(0, raw.size()-1); 
+	} else return 1;
+
+	std::vector<Board> boards;
+
+	std::vector<std::string> str_boards;
+	split(str_boards, raw, "\n\n");
+	for (auto s : str_boards) {
+		boards.emplace_back(s);
+	}
+
+	bool flag = false;
+	std::vector<Board> filtered = boards;
+	for (int ex : extract) {
+		std::cout << ex << " " << filtered.size() << std::endl;
+		std::vector<Board> next;
+		int size = filtered.size(), seen = 0;;
+		for (auto& board : filtered) {
+			board.mark(ex);
+			if (board.win() && filtered.size() != 1) {
+				if (!flag) {
+					std::cout << "first winner product: " << ex * board.score() << ", "
+						<< "ex: " << ex << ", score: " << board.score() << std::endl;
+					flag = true;
+				}
+			} else {
+				next.push_back(board);
+			}
+		}
+		if (next.size() == 1 && next[0].win()) {
+			int score = next[0].score();
+			std::cout << "last winner product: " << ex * score << ", "
+				<< "ex: " << ex << ", score: " << score << std::endl;
+			break;
+		}
+		filtered = next;
+	}
+
+	return 0;
+}
diff --git a/day04/day04_input.txt b/day04/day04_input.txt
new file mode 100644
index 0000000..033baa2
--- /dev/null
+++ b/day04/day04_input.txt
@@ -0,0 +1,601 @@
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diff --git a/day04/day04_input_ez.txt b/day04/day04_input_ez.txt
new file mode 100644
index 0000000..669a51d
--- /dev/null
+++ b/day04/day04_input_ez.txt
@@ -0,0 +1,19 @@
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
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diff --git a/day04/makefile b/day04/makefile
new file mode 100644
index 0000000..ef809af
--- /dev/null
+++ b/day04/makefile
@@ -0,0 +1,2 @@
+all day04.cpp:
+	g++ -std=c++20 -o day04 day04.cpp
-- 
cgit v1.2.3-54-g00ecf