Solve 2024-03

2024/03/2024-03.run.xml

@@ -0,0 +1,7 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="2024-03" type="BunRunConfiguration">
+    <option name="program" value="2024/03/run.ts" />
+    <option name="workingDirectory" value="$PROJECT_DIR$" />
+    <method v="2" />
+  </configuration>
+</component>

2024/03/index.test.ts

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+import { describe, expect, it } from 'bun:test';
+import { solveFirst, solveSecond } from './index.ts';
+
+describe('2024-03', () => {
+  it('first', () => {
+    const testInput = `xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))`;
+    expect(solveFirst(testInput)).toBe(161);
+  });
+  it('second', () => {
+    const testInput = `xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))`;
+    expect(solveSecond(testInput)).toBe(48);
+  });
+});

2024/03/index.ts

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+import { sumArray } from '../../utils/array';
+
+export function solveFirst(input: string): number {
+  return sumArray(findAndEvalMul(input));
+}
+
+function findAndEvalMul(line?: string | null | undefined) {
+  return Array.from(
+    (line || '').matchAll(/mul\((\d{1,3}),(\d{1,3})\)/gm),
+    (m) => Number(m[1]) * Number(m[2])
+  );
+}
+
+export function solveSecond(input: string): number {
+  const splits = input.split('do()').map((l) => l.split("don't()")[0]);
+
+  return sumArray(splits.flatMap(findAndEvalMul));
+}

2024/03/run.ts

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+import { join } from 'path';
+import { solveFirst, solveSecond } from './index.ts';
+
+const input = await Bun.file(join(__dirname, 'input.txt')).text();
+
+const firstAnswer = solveFirst(input);
+
+console.log(firstAnswer);
+
+const secondAnswer = solveSecond(input);
+
+console.log(secondAnswer);