5 files changed, 756 insertions, 0 deletions

diff --git a/day04/day04 b/day04/day04
new file mode 100755
index 0000000..b28d295
--- /dev/null
+++ b/day04/day04
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 @@
+38,54,68,93,72,12,33,8,98,88,21,91,53,61,26,36,18,80,73,47,3,5,55,92,67,52,25,40,56,95,9,62,30,31,85,65,14,2,78,75,15,39,87,27,58,42,60,32,41,83,51,77,10,66,70,4,37,6,89,23,16,49,48,63,94,97,86,64,74,82,7,0,11,71,44,43,50,69,45,81,20,28,46,79,90,34,35,96,99,59,1,76,22,24,17,57,13,19,84,29
+
+57  7  8 38 31
+17 96  5 12 18
+58 45 81 89  4
+73 51 93 32 10
+74 50 26  0 24
+
+79 67 21 84 71
+25 22 19 80 13
+10 63 90 78 33
+93 50 89 58 87
+91  7 45  6 41
+
+66 85  4 91 41
+59 69 16  0 90
+35 13 64 61 93
+11 20 29 67 77
+92 75 58  3 34
+
+19  1 34 50 76
+26 75  8 28 20
+96 64 49 77  2
+18 58 62 53 60
+82 99 38 10 83
+
+89 69 97 16 48
+32  3 83 17 33
+82 53 15 50 94
+52  0 86 25 81
+42 38 84 73 76
+
+68 18 44 61 66
+24 21 22  6 41
+48 29  4 64 78
+93 25 88 95 96
+72 49 51  2  5
+
+35 41 59 23 21
+ 0 66 34 12 85
+61 26 29 68  5
+28 69 90  2 96
+ 1 16 32 24 44
+
+98 73 33 82 18
+51 62 88 67  6
+99 44 53 39 36
+34 90 50 72 43
+64 40 11 26  5
+
+88  8 81 57 99
+61 16 22 50  5
+26 84 85  7 15
+97 27 47 18 21
+ 3 78 66 94 58
+
+56 40 68 20 24
+26 98  6 76 89
+61 63 22 99 83
+31  5 32 54 82
+18 23 17 46 13
+
+35 95 67 73 13
+86 33  7  9 43
+44 28 55 32 52
+54 91 84 97 98
+17 49 93 23 56
+
+22 90 61 12 13
+87  4 46 25 88
+70 38 53 80 11
+75 56 96 49 32
+ 3 55 43 19 67
+
+40 17 70 76 61
+82 86 37  8 28
+60 48 24 83 53
+57 87 44 92 63
+10 49 88 15 55
+
+36 80 47 46 84
+25 70  2 79 75
+55  5 13 99 45
+54 73 83 59 67
+57  0 69 33 68
+
+51 52 21 44 36
+17 30 15 42 18
+ 6  3 47 94  2
+57 77 45 70 90
+29 60 19  9 84
+
+16 12 37  6 27
+86 87 21 70 71
+84  0 11 67 83
+ 5 68 33 23 26
+51 43 28 79 49
+
+22  5 53 12 42
+29 81 46 13 88
+80 65  8 62 33
+72 67 34 21 35
+38 77 90 52 44
+
+63 57 52 82 96
+46 11 32 20 58
+35 15 83  1 55
+18 16 73 19 17
+22 88 45 95 47
+
+43 15  7 97 88
+96 52 84 86 49
+80 13 21 28 29
+16 36 98 82 41
+32 10 62 68 24
+
+46 69  8 55 50
+28 21 92 79 73
+19 71 74 53 44
+24 27 10 14 85
+ 2 39 58 81 72
+
+68 74 43 62 61
+82 73 37 40 93
+16  7 41 54 96
+10  3 85 70 65
+69 71 94  5 81
+
+17 53 87 80 98
+76 41 30 25 58
+29 14 73 74 43
+20 91 24 70 39
+46 48 51  9 18
+
+20 41 36 81 93
+46 75 33 73 78
+26 16 80 54 90
+87 17 12 67  1
+51 10 39 91 45
+
+76 21 31  3 69
+27 42 97 32 87
+26 22  4 63 38
+46 77 67 80 43
+37 50 59 88 96
+
+17 16 10 68 76
+ 2 45 94 29 40
+ 1 54 60 66 93
+ 0 13 42 39 70
+ 6 82 46 74 43
+
+87 95 31 22 94
+86 30 39 56 18
+89 74 23 11 64
+63 48 85 20 49
+27 15 40 83 50
+
+81 48 47 73 95
+40 65 89 69  5
+38 76 85 30 11
+31 61  8 67 62
+41 68 42 78 20
+
+46 85 96 83 20
+94 52  7 97 31
+29 95 99 34 62
+ 8 69  6 51 54
+38 59  5 56 55
+
+18 15 10 35 96
+44 66 58 91  9
+12  2 45 98 80
+22 69 37 67 79
+46 36 23 51 75
+
+11 58 64 85 26
+21 43 32 36 65
+94 61 40 68 67
+14 23  6 53  2
+93  9 74  3 90
+
+73 82 46 37 20
+47 75 38 45 54
+76 34 65 44 58
+93 89 27 13 33
+85 67 40 42 17
+
+13 66  2 65 10
+98  4 83 79 92
+22 48 93  6 23
+24 39 17 60  9
+77 49 16 19 35
+
+96 37 88  4 32
+80 89 59 39 63
+67 19 35 10 40
+91 66 47  9 79
+45 21 86 92 30
+
+76 85 37 32 29
+59 41 44 23 93
+86 24 83 81 57
+22 21 82 53 16
+38 99 79 49 30
+
+54 29 64 65 62
+44 59 83 75 56
+11 13 34 12 24
+96 39 31 95 16
+41 38 21 25 60
+
+49  8  3 67  2
+30 81 39 26 33
+83 73 47 32 65
+48 20 75 24 40
+74 28 11 19 96
+
+87 25 49 81  7
+99 34 35 50 86
+18 24 68  4 78
+59  8 71  0 41
+92 54 64 75 46
+
+ 2 19 73 29 10
+55  6 43 48 22
+64 14 62 39 97
+99 26 68 25 12
+98 72 45 38 40
+
+59 76 40 37  9
+42 23  1 12 54
+49 51 17 11 34
+74 95 26 78 67
+65 32 98 80 45
+
+50 86 95 29 38
+ 6 11 24 10 73
+63 28 30 46 68
+34  9 20 58 77
+88 52 79 89 98
+
+32 20 93 39 80
+67 98 99  4 26
+22 89 97 13 73
+88 11 72 31 78
+76 95 64 43 75
+
+75 23 81 89 90
+98 86 88 38 99
+51  7 65  2  3
+16 59 49 41 87
+57 20 58 72 83
+
+21 81 24 43 12
+55 74  2 90  5
+13 89 59 42  3
+47 66 38 20 62
+61 56 72 84 41
+
+83 68 73 77 66
+96 48 24  7 98
+57  4 86 10 34
+22 46 80 75 49
+89 35 60 79 37
+
+27 50 90 37 28
+81 74 58 39 61
+ 8 72 31 85 57
+52 43  9  5 91
+68 86  0  4 89
+
+14 41 70 67 59
+13 94 31 69 65
+76 19  9 79  1
+33 20 53 91 36
+80 50 21 37 85
+
+16 47 62 33 12
+11 74 44 63 60
+ 2 23 84 80 42
+14 58 67 81 24
+ 8 29 31 91 43
+
+62 86 26 57 74
+ 9 46 47 81 39
+ 4 99 59 89  3
+20 76 51 70 84
+95 72 43 67 61
+
+75 93 56 15 30
+11 49 97 16 45
+52 91 21 92 62
+ 0 74 85 48 63
+28 76 59 79 60
+
+36 18  0 69 10
+34 33 21  5 23
+73 42 50 14 11
+75 26 95 79 51
+76 93  1 43 22
+
+86 64 25  9 54
+67 79 49  1  8
+63 47 60  4 46
+94 97 57 38 30
+91 87  0 68 15
+
+94 46  6 69  9
+18 49 43 30 31
+79 35 76 45 92
+67 89 82  2 57
+65 21 24 81 52
+
+ 5 58 43 37 61
+65 67 54 15 50
+69 75 14 17 96
+23 95 71 33  9
+68 82 10  3 29
+
+56 43 88 35 82
+44 14 64 60 23
+33  5 96 86 47
+70 74 27  4  1
+51 71 95 59 11
+
+46 14 44  6 19
+54 81 59 31 28
+ 7 67 73 23 86
+25 91 57 43 92
+65 76 80 47 77
+
+ 3 39 70 90 23
+64 77 33 83 22
+ 6 36 81 80 68
+85 45 72 53 42
+ 7 19 88 13  9
+
+88  3 72  6 29
+33 13  1 85 68
+28 32 78  8 63
+15 99 35 80 41
+61 50 43 53 39
+
+22 88 19 86 54
+78  3 70 65 85
+18 12 21 14 17
+ 5 48 64 81 71
+89 91 55 30 87
+
+35 82 37 42 25
+44 53 12  2 73
+18 24  0 75 51
+34 26 54 52 86
+56 64 31 57 80
+
+45 97 83 15  5
+40 77  1 53 84
+67 44 52 37 20
+36 64 33 82 90
+49 22  6 65 99
+
+18 69 23 78 55
+45  4 31 54 44
+16 97 13 81 86
+77 87 91 53 33
+ 1 84 83 75 40
+
+95 46 89  7 38
+83 32 99 44 20
+ 6 57 37 34 48
+69  5 84 29 54
+62 27 13 80 53
+
+45 92 59 71 83
+52 75 42 46 86
+76 33 50 80 69
+36 89 90  3 31
+ 7  5 48 38 53
+
+86 80 77 18 87
+79 93 52 17 20
+30 68 48 12 91
+25 98 13  9 47
+45 73 97 15 59
+
+93 60 34 18 25
+38 80 81 91 40
+43 87 20 79  7
+70 68  6 24 23
+46 97 32 78 67
+
+ 9  6 28 17 42
+ 2 86 84 90 13
+91 58 16 37 76
+15  3 45 51  4
+64 99 41 59 39
+
+44  3 85 80 93
+ 0 43 90 40 89
+82 91 55 79 75
+30  5 68 50  1
+37 24 59 62 66
+
+38 55 21 45  1
+23 14 95 25 22
+84 10 39  9  0
+17 15 58 70 49
+62 44 77 65 88
+
+ 8 62 25 75 39
+20 95 65 11 32
+ 5 92 15 86 66
+64 34 60  7 85
+10 76  6 53 61
+
+71 61 62 25 35
+23 30 37 14  9
+99 98 52 51 19
+77 57 17 72 85
+33 91 31 43 67
+
+76 66 39 36 44
+49 97 93 33 52
+13 70 21 17 32
+71 98 80 19 60
+73 15 99 74  9
+
+41  8 33 29 87
+42 86 66 31 50
+45 60 83 81 21
+36  4 98 43  0
+49 76 18 90 16
+
+83 53 34 39 58
+91 68 17 62  4
+ 2 76 44 31 35
+14 61 49 84 92
+73  6 86 27 65
+
+56 70 47 60 97
+35 89 26 99 59
+67 23 27 74 65
+61 62 15 18 45
+54 93  0  9 71
+
+11 24 97 15 30
+46 74 17 48 43
+16 64 72 60 37
+63 90 41 91 66
+25 95  1 54 49
+
+87 67 27 26 38
+63 44 65 25 81
+ 1 66 96 62 17
+82  2 58  4 86
+61 64 54 24 90
+
+72 94 69 85 43
+38 11 93 39 13
+86 92 12 42 75
+ 6 89 58 88 52
+79 19 20 55 14
+
+77 93 58  6 52
+27 48 29 60 71
+87 24 25 54 49
+53 38 90 51 80
+57 50 18  1 13
+
+85 84 54  2 51
+33 41  0 38 80
+ 5 62  1 28 96
+17 88 64 26 90
+78 91 56 34 74
+
+83 14 82  6 55
+30 13 99 57 39
+93 73 37 19  8
+29 49 76 22 92
+69 66  9 60 53
+
+51 78 52 72 79
+42 55 74 88 44
+90 75 65 87 69
+22 35 64 36 86
+63 41 19 59 49
+
+49 86 81 23 12
+93 16  9  8 95
+68 33  4 82 61
+45 28 85 87 38
+35 70 63 18 52
+
+63 93 38 34 61
+75 21 86 42 25
+52 85 99 24 36
+41 11 79 54 47
+44 84 65 28 89
+
+91 37 30 39 59
+ 7 94 90 38 40
+72 21 75 31 61
+68 42 34 20  8
+ 3 16 76 44 57
+
+32 55 36 81 42
+21 75 68 28 65
+46 70 29 54 64
+66 89 96 25 43
+79 76 41 77 71
+
+41 29 60 74 34
+84 49 83 72 92
+22  6 21 17 94
+15 44 62 28  2
+25 93 64  1 42
+
+68 76 23 62 10
+36 87 15 12 57
+79 46 18 83 11
+48 81 58 52 28
+72 40 64 55 21
+
+25 51 42 63 41
+ 0 72 92 23 13
+65  1 69 33  2
+78 27 95 61 55
+30 54 48  3 57
+
+50 40 58 66 59
+84 79 64 75 44
+88 93 41 25 97
+19 86 37 91 81
+10 26 94 77 34
+
+76 44 11 16 60
+19 92 91 58 50
+97  5 46  4 52
+87 42 65 75 15
+12  2 54 27 86
+
+77 38 51 29 89
+ 7 76 54 48 44
+88 50  2  5 53
+12 70 26 57 74
+31 19 18 34 47
+
+35 99 86 96 62
+61 97 71 70 66
+49 55 36 76  3
+94 23 31 91 26
+80  8 20 95 15
+
+ 4 96 40 36 12
+87 75 38 30 11
+69 29 23 85 91
+49  5 14 57 24
+88 20 99 78 65
+
+34 65 71 79 67
+28  1 33 47 11
+15 86 84 83 55
+35 10 19 63 23
+58 66 45 77 26
+
+74 13 25 39  8
+46 47 77 37  0
+60  1 81 42 18
+ 5 51 78 30  4
+36 12 10 32 82
+
+51 83 58 10 56
+28 18 43 99 14
+ 3 57 30 49 88
+20 68 76 73 82
+ 1 85 77 22 47
+
+50 12 11 97 83
+40 10 49 81 63
+43 15 91  3  2
+52 20 53 89 33
+42 94 59 78 46
+
+19 63 86 82  9
+69 13 27 88 37
+45 51 79 11  8
+ 2 29 41 84 73
+76 24 78 96 38
+
+15 19 88 95 54
+28 94 96 27 26
+ 8 82 68  6 71
+33  9 99 62 63
+38 83 41 14 79
+
+67 57  2 21 19
+11 79 74 45 95
+42 90 68 47 62
+80 61  1  0 39
+43 76 40 27 66
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
+
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
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