Solve 2025-10, add z3 solver

2025/10/2025-10.run.xml

@@ -0,0 +1,7 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="2025-10" type="BunRunConfiguration">
+    <option name="program" value="2025/10/run.ts" />
+    <option name="workingDirectory" value="$PROJECT_DIR$" />
+    <method v="2" />
+  </configuration>
+</component>

2025/10/index.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, it } from 'bun:test';
+import { solveFirst } from './index.ts';
+
+describe('2025-10', () => {
+  const testInput = `[.##.] (3) (1,3) (2) (2,3) (0,2) (0,1) {3,5,4,7}
+[...#.] (0,2,3,4) (2,3) (0,4) (0,1,2) (1,2,3,4) {7,5,12,7,2}
+[.###.#] (0,1,2,3,4) (0,3,4) (0,1,2,4,5) (1,2) {10,11,11,5,10,5}`;
+  it('first', () => {
+    expect(solveFirst(testInput)).toBe(7);
+  });
+});

2025/10/index.ts

@@ -0,0 +1,58 @@
+import { sumArray } from '../../utils/array.ts';
+
+type Indicators = boolean[];
+export function parseInput(input: string) {
+  return input.split('\n').map((row) => {
+    const buttons = row.split(' ').map((p) => p.substring(1, p.length - 1));
+    const indicators = buttons
+      .splice(0, 1)[0]
+      .split('')
+      .map((d) => d === '#') as Indicators;
+    const joltage = buttons.splice(-1, 1)[0].split(',').map(Number);
+
+    return {
+      buttons: buttons.map((btns) => btns.split(',').map(Number)),
+      indicators,
+      joltage
+    };
+  });
+}
+
+export function solveFirst(input: string): number {
+  const machines = parseInput(input);
+  const steps = machines.map(({ buttons, indicators }) => {
+    const start = new Array(indicators.length).fill(false) as Indicators;
+    const queue = [[start, 0] as [Indicators, number]];
+    const visited = new Set<string>();
+
+    const goal = toStr(indicators);
+
+    while (queue.length > 0) {
+      const [state, step] = queue.shift()!;
+      const stateStr = toStr(state);
+      if (stateStr === goal) {
+        return step;
+      }
+      if (visited.has(stateStr)) {
+        continue;
+      }
+      visited.add(stateStr);
+      buttons.forEach((button) => {
+        const alteration = [...state];
+        button.forEach((b) => (alteration[b] = !alteration[b]));
+        if (visited.has(toStr(alteration))) {
+          return;
+        }
+        queue.push([alteration, step + 1]);
+      });
+    }
+
+    return 0;
+  });
+
+  return sumArray(steps);
+}
+
+function toStr(state: Indicators) {
+  return state.map((v) => (v ? '#' : '.')).join();
+}

2025/10/part2.ts

@@ -0,0 +1,57 @@
+import { type Arith, init } from 'z3-solver';
+
+import { readFile } from 'fs/promises';
+import { dirname, join } from 'path';
+import { fileURLToPath } from 'url';
+import { parseInput } from './index.ts';
+
+if (globalThis.Bun !== undefined) {
+  console.error('This only runs with node!');
+  process.exit(1);
+}
+
+const data = await readFile(
+  join(dirname(fileURLToPath(import.meta.url)), 'input.txt'),
+  'utf8'
+);
+const cleanData = parseInput(data.trim());
+
+const { Context } = await init();
+const counts = await Promise.all(
+  cleanData.map(async ({ buttons, joltage }) => {
+    const { Optimize, Int } = Context('main');
+
+    const bbtns = buttons.map((b) =>
+      new Array(joltage.length).fill(0).map((_, i) => (b.includes(i) ? 1 : 0))
+    );
+    const solver = new Optimize();
+
+    const vars = bbtns.map((_, i) => {
+      const v = Int.const(i.toString());
+      solver.add(v.ge(0));
+
+      return v;
+    });
+
+    joltage.forEach((vol, i) => {
+      const condition = bbtns.reduce(
+        (cond, btn, y) => (btn[i] === 1 ? cond.add(vars[y]) : cond),
+        Int.val(0) as Arith
+      );
+
+      solver.add(condition.eq(Int.val(vol)));
+    });
+
+    const sumVars = vars.reduce((a, v) => a.add(v), Int.val(0));
+
+    solver.minimize(sumVars);
+
+    const result = await solver.check();
+    if (result === 'sat') {
+      return Number(solver.model().eval(sumVars).toString());
+    }
+    return 0;
+  })
+);
+
+console.log(counts.reduce((a, c) => a + c, 0));

2025/10/run.ts

@@ -0,0 +1,8 @@
+import { join } from 'path';
+import { solveFirst } from './index.ts';
+
+const input = await Bun.file(join(__dirname, 'input.txt')).text();
+
+const firstAnswer = solveFirst(input);
+
+console.log(firstAnswer);

bun.lock

@@ -5,6 +5,7 @@
       "name": "aoc",
       "dependencies": {
         "javascript-astar": "^0.4.1",
+        "z3-solver": "^4.15.4",
       },
       "devDependencies": {
         "@types/bun": "latest",
@@ -44,6 +45,8 @@
 
     "ansi-styles": ["ansi-styles@4.3.0", "", { "dependencies": { "color-convert": "^2.0.1" } }, "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg=="],
 
+    "async-mutex": ["async-mutex@0.3.2", "", { "dependencies": { "tslib": "^2.3.1" } }, "sha512-HuTK7E7MT7jZEh1P9GtRW9+aTWiDWWi9InbZ5hjxrnRa39KS4BW04+xLBhYNS2aXhHUIKZSw3gj4Pn1pj+qGAA=="],
+
     "balanced-match": ["balanced-match@1.0.2", "", {}, "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw=="],
 
     "brace-expansion": ["brace-expansion@2.0.1", "", { "dependencies": { "balanced-match": "^1.0.0" } }, "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA=="],
@@ -124,6 +127,8 @@
 
     "strip-ansi-cjs": ["strip-ansi@6.0.1", "", { "dependencies": { "ansi-regex": "^5.0.1" } }, "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A=="],
 
+    "tslib": ["tslib@2.8.1", "", {}, "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w=="],
+
     "typescript": ["typescript@5.7.2", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-i5t66RHxDvVN40HfDd1PsEThGNnlMCMT3jMUuoh9/0TaqWevNontacunWyN02LA9/fIbEWlcHZcgTKb9QoaLfg=="],
 
     "undici-types": ["undici-types@5.26.5", "", {}, "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA=="],
@@ -142,6 +147,8 @@
 
     "yocto-queue": ["yocto-queue@1.1.1", "", {}, "sha512-b4JR1PFR10y1mKjhHY9LaGo6tmrgjit7hxVIeAmyMw3jegXR4dhYqLaQF5zMXZxY7tLpMyJeLjr1C4rLmkVe8g=="],
 
+    "z3-solver": ["z3-solver@4.15.4", "", { "dependencies": { "async-mutex": "^0.3.2" } }, "sha512-Tcv55+k5VsPQEX7R3gIu5ieUeLp9fP1r+8+c85dQORj/v4Fy+LvOzVzZZtg4mJjUgfIhGCg6ZfAeiUiUxDPRVg=="],
+
     "@isaacs/cliui/string-width": ["string-width@5.1.2", "", { "dependencies": { "eastasianwidth": "^0.2.0", "emoji-regex": "^9.2.2", "strip-ansi": "^7.0.1" } }, "sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA=="],
 
     "@isaacs/cliui/strip-ansi": ["strip-ansi@7.1.0", "", { "dependencies": { "ansi-regex": "^6.0.1" } }, "sha512-iq6eVVI64nQQTRYq2KtEg2d2uU7LElhTJwsH4YzIHZshxlgZms/wIc4VoDQTlG/IvVIrBKG06CrZnp0qv7hkcQ=="],

package.json

@@ -26,6 +26,7 @@
     "typescript": "^5.7.2"
   },
   "dependencies": {
-    "javascript-astar": "^0.4.1"
+    "javascript-astar": "^0.4.1",
+    "z3-solver": "^4.15.4"
   }
 }