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Diffstat (limited to 'day04')
-rwxr-xr-xday04/day04bin0 -> 116280 bytes
-rw-r--r--day04/day04.cpp134
-rw-r--r--day04/day04_input.txt601
-rw-r--r--day04/day04_input_ez.txt19
-rw-r--r--day04/makefile2
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
Binary files 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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+
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+
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+ 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