Solve 2025-03

2025/03/2025-03.run.xml

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+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="2025-03" type="BunRunConfiguration">
+    <option name="program" value="2025/03/run.ts" />
+    <option name="workingDirectory" value="$PROJECT_DIR$" />
+    <method v="2" />
+  </configuration>
+</component>

2025/03/index.test.ts

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+import { describe, expect, it } from 'bun:test';
+import { solveFirst, solveSecond } from './index.ts';
+
+describe('2025-03', () => {
+  const testInput = `987654321111111
+811111111111119
+234234234234278
+818181911112111`;
+  it('first', () => {
+    expect(solveFirst(testInput)).toBe(357);
+  });
+  it('second', () => {
+    expect(solveSecond(testInput)).toBe(3121910778619);
+  });
+});

2025/03/index.ts

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+import { sumArray } from '../../utils/array.ts';
+
+function findHighestDigit(digits: number[], start: number, end: number) {
+  let highest = 0;
+  let highestI = start;
+
+  for (let i = start; i < digits.length - end; i++) {
+    if (digits[i] > highest) {
+      highest = digits[i];
+      highestI = i;
+    }
+  }
+
+  return highestI;
+}
+
+function findHighestNumber(row: string, size: number) {
+  const rowSplit = row.split('');
+  const digits = rowSplit.map(Number);
+
+  const highest: number[] = [];
+  for (let i = 0; i < size; i++) {
+    const highestDigit = findHighestDigit(
+      digits,
+      (i > 0 ? highest[i - 1] : -1) + 1,
+      size - i - 1
+    );
+
+    highest.push(highestDigit);
+  }
+
+  return Number(highest.map((key) => rowSplit[key]).join(''));
+}
+
+export function solveFirst(input: string): number {
+  const rows = input.split('\n');
+
+  return sumArray(rows.map((row) => findHighestNumber(row, 2)));
+}
+
+export function solveSecond(input: string): number {
+  const rows = input.split('\n');
+
+  return sumArray(rows.map((row) => findHighestNumber(row, 12)));
+}

2025/03/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);