2021.10

challenges/2021/10.js

@@ -0,0 +1,56 @@
+// Part 1
+const solvePuzzle1 = (input) =>
+  parseInput(input).reduce((acc, line) => {
+    const [status, result] = closeChunks(line);
+    return status === "illegal" ? acc + result : acc;
+  }, 0);
+
+// Part 2
+const solvePuzzle2 = (input) => {
+  const scores = [];
+
+  parseInput(input).forEach((line) => {
+    const [status, result] = closeChunks(line);
+    if (status === "legit" && result.length) {
+      let sum = 0;
+      while (result.length) {
+        const openingCharIdx = openingChars.indexOf(result[result.length - 1]);
+        sum = sum * 5 + closingCharScores[openingCharIdx];
+        result.pop();
+      }
+      scores.push(sum);
+    }
+  });
+
+  return scores.sort((a, b) => a - b)[(scores.length - 1) / 2];
+};
+
+const openingChars = ["{", "[", "(", "<"];
+const closingChars = ["}", "]", ")", ">"];
+const illegalCharScores = [1197, 57, 3, 25137];
+const closingCharScores = [3, 2, 1, 4];
+
+const closeChunks = (line) => {
+  const stack = [];
+
+  for (const char of line) {
+    const lastChar = stack[stack.length - 1];
+    if (!lastChar || openingChars.includes(char)) {
+      stack.push(char);
+    } else {
+      const closingCharIdx = closingChars.indexOf(char);
+      if (lastChar === openingChars[closingCharIdx]) {
+        stack.pop();
+      } else {
+        return ["illegal", illegalCharScores[closingCharIdx]];
+      }
+    }
+  }
+
+  return ["legit", stack];
+};
+
+const parseInput = (input) => input.split("\n").map((l) => l.split(""));
+
+require(__dirname + "/../../utils/test.js").test(__filename, __dirname, solvePuzzle1);
+require(__dirname + "/../../utils/test.js").test(__filename, __dirname, solvePuzzle2);

challenges/2021/inputs/10.txt

@@ -0,0 +1,94 @@
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