day 9 pt 1 done

day9/.gitignore

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+node_modules/
+.node_modules/
+built/*
+tests/cases/rwc/*
+tests/cases/test262/*
+tests/cases/perf/*
+!tests/cases/webharness/compilerToString.js
+test-args.txt
+~*.docx
+\#*\#
+.\#*
+tests/baselines/local/*
+tests/baselines/local.old/*
+tests/services/baselines/local/*
+tests/baselines/prototyping/local/*
+tests/baselines/rwc/*
+tests/baselines/test262/*
+tests/baselines/reference/projectOutput/*
+tests/baselines/local/projectOutput/*
+tests/baselines/reference/testresults.tap
+tests/services/baselines/prototyping/local/*
+tests/services/browser/typescriptServices.js
+src/harness/*.js
+src/compiler/diagnosticInformationMap.generated.ts
+src/compiler/diagnosticMessages.generated.json
+src/parser/diagnosticInformationMap.generated.ts
+src/parser/diagnosticMessages.generated.json
+rwc-report.html
+*.swp
+build.json
+*.actual
+tests/webTestServer.js
+tests/webTestServer.js.map
+tests/webhost/*.d.ts
+tests/webhost/webtsc.js
+tests/cases/**/*.js
+!tests/cases/docker/*.js/
+tests/cases/**/*.js.map
+*.config
+scripts/eslint/built/
+scripts/debug.bat
+scripts/run.bat
+scripts/**/*.js
+scripts/**/*.js.map
+coverage/
+internal/
+**/.DS_Store
+.settings
+**/.vs
+**/.vscode/*
+!**/.vscode/tasks.json
+!**/.vscode/settings.template.json
+!**/.vscode/launch.template.json
+!**/.vscode/extensions.json
+!tests/cases/projects/projectOption/**/node_modules
+!tests/cases/projects/NodeModulesSearch/**/*
+!tests/baselines/reference/project/nodeModules*/**/*
+.idea
+yarn.lock
+yarn-error.log
+.parallelperf.*
+tests/cases/user/*/package-lock.json
+tests/cases/user/*/node_modules/
+tests/cases/user/*/**/*.js
+tests/cases/user/*/**/*.js.map
+tests/cases/user/*/**/*.d.ts
+!tests/cases/user/zone.js/
+!tests/cases/user/bignumber.js/
+!tests/cases/user/discord.js/
+tests/baselines/reference/dt
+.failed-tests
+TEST-results.xml
+package-lock.json
+tests/cases/user/npm/npm
+tests/cases/user/TypeScript-React-Starter/TypeScript-React-Starter
+tests/cases/user/TypeScript-Node-Starter/TypeScript-Node-Starter
+tests/cases/user/TypeScript-React-Native-Starter/TypeScript-React-Native-Starter
+tests/cases/user/TypeScript-Vue-Starter/TypeScript-Vue-Starter
+tests/cases/user/TypeScript-WeChat-Starter/TypeScript-WeChat-Starter
+tests/cases/user/create-react-app/create-react-app
+tests/cases/user/fp-ts/fp-ts
+tests/cases/user/webpack/webpack
+tests/cases/user/puppeteer/puppeteer
+tests/cases/user/axios-src/axios-src
+tests/cases/user/prettier/prettier
+.eslintcache

day9/input

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+R 5
+U 8
+L 8
+D 3
+R 17
+D 10
+L 25
+U 20

day9/package.json

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+{
+  "devDependencies": {
+    "@types/node": "^18.11.10"
+  }
+}

day9/solution.ts

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+import { readFileSync } from 'fs';
+import { join } from 'path';
+
+function distance(p1: number[], p2: number[]): number {
+    var x = p1[0] - p2[0];
+    var y = p1[1] - p2[1];
+    return Math.abs(x) + Math.abs(y)
+}
+
+const clamp = (num, min, max) => Math.min(Math.max(num, min), max);
+
+const fileString = readFileSync(join(__dirname, "inp"), 'utf-8');
+var commands = fileString.split("\n");
+commands = commands.filter(val => {
+  return val.length > 0;
+})
+commands = commands.map(val => {
+  return val.trim();
+})
+const cmds =  commands.map(val => {
+  return val.split(" ");
+})
+
+console.log(cmds);
+
+var positions = {};
+
+var pointlist = [];
+const POINTS = 10;
+for (var l = 0; l < POINTS; l++) {
+  pointlist.push([0, 0])
+}
+positions[pointlist[0].toString()] = 1;
+
+for (const command of cmds) {
+  const direction = command[0];
+  const count = +command[1];
+  for (var j = 0; j < POINTS; j++){
+    for (var k = 0; k < count; k ++) {
+      if (j == 0) {
+        switch(direction) {
+          case 'U':
+            pointlist[j] = [pointlist[j][0], pointlist[j][1] + 1];
+            break;
+          case 'D':
+            pointlist[j] = [pointlist[j][0], pointlist[j][1] - 1];
+            break;
+          case 'L':
+            pointlist[j] = [pointlist[j][0] - 1, pointlist[j][1]];
+            break;
+          case 'R':
+            pointlist[j] = [pointlist[j][0] + 1, pointlist[j][1]];
+            break;
+        }
+      } else {
+        var currentPosition = pointlist[j];
+        var currentHeadPosition = pointlist[j - 1];
+        if (
+          (Math.abs(currentHeadPosition[0] - currentPosition[0]) > 1) ||
+          (Math.abs(currentHeadPosition[1] - currentPosition[1]) > 1)
+        ) {
+          var xdiff = clamp(currentHeadPosition[0] - currentPosition[0], -1, 1);
+          var ydiff = clamp(currentHeadPosition[1] - currentPosition[1], -1, 1);
+          currentPosition = [currentPosition[0] + xdiff, currentPosition[1] + ydiff];
+          pointlist[j] = currentPosition;
+
+          if (j == 9) {
+            if(currentPosition.toString() in positions) {
+              positions[currentPosition.toString()] += 1;
+            } else {
+              positions[currentPosition.toString()] = 1;
+            }
+          }
+        }
+      }
+    }
+  }
+  console.log(pointlist);
+}
+
+console.log(Object.keys(positions).length);

day9/tsconfig.json

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+{
+  "compilerOptions": {
+    "types": [
+      "node"
+    ]
+  }
+}