From 1443aa828f58a1e2e61ca821cfac77850376c3eb Mon Sep 17 00:00:00 2001
From: Eric Wagoner <ewagoner@gmail.com>
Date: Sat, 4 Dec 2021 21:10:21 -0500
Subject: [PATCH] Solutions for day four

---
 04/code.js   |  78 +++++++
 04/input.txt | 601 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 679 insertions(+)
 create mode 100644 04/code.js
 create mode 100644 04/input.txt

diff --git a/04/code.js b/04/code.js
new file mode 100644
index 0000000..7edc2c0
--- /dev/null
+++ b/04/code.js
@@ -0,0 +1,78 @@
+const fs = require('fs');
+const inputArray = fs.readFileSync('input.txt').toString().split("\n");
+
+const numbers = inputArray.shift().split(",");
+const boards = [];
+const winningBoards = [];
+const answers = [];
+
+for(let i = 0; i < inputArray.length; i++) {
+  if (!inputArray[i]) {
+    const board = [];
+    for (let x = i+1; x < i+6; x++) {
+      board.push(inputArray[x].trim().split(/\s+/).map(Number));
+    }
+    boards.push(board)
+  }
+}
+
+function markBoards(number) {
+  for (const b of boards) {
+    for (const r of b) {
+      if (r.indexOf(number) >= 0) {
+        r[r.indexOf(number)] = null;
+      }
+    }
+  }
+
+}
+
+function findWinner() {
+  let winners = new Map;
+  for (const b in boards) {
+    if (!winningBoards.includes(b)) {
+      const columnTotals = [0, 0, 0, 0, 0];
+      const rowTotals = [0, 0, 0, 0, 0];
+      for (const r in boards[b]) {
+        let total = 0;
+        for (const i in boards[b][r]) {
+          total = total + boards[b][r][i] || 0;
+          columnTotals[i] = columnTotals[i] + boards[b][r][i]|| 0;
+        }
+        rowTotals[r] = total;
+      }
+
+      if(columnTotals.filter(e => e === 0).length || rowTotals.filter(e => e === 0).length) {
+        winningBoards.push(b);
+        winners.set(b,columnTotals.reduce((columnTotals, a) => columnTotals + a, 0));
+      }
+    }
+  }
+
+  return winners;
+}
+
+
+// Part One
+
+for (n of numbers) {
+  const number = parseInt(n);
+  markBoards(number);
+  const winners = findWinner();
+
+  winners.forEach((value, key) =>
+  {
+    const answer = value * number;
+    answers.push(answer)
+    //console.log(answer);
+    //process.exit();
+  })
+
+
+}
+
+// Part Two
+
+console.log(answers[answers.length-1])
+
+
diff --git a/04/input.txt b/04/input.txt
new file mode 100644
index 0000000..6ea541f
--- /dev/null
+++ b/04/input.txt
@@ -0,0 +1,601 @@
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\ No newline at end of file