99techteam · dangvu0502 · Aug 4, 2025 · Aug 5, 2025 · Aug 5, 2025 · Aug 5, 2025
diff --git a/src/problem1/.keep b/src/problem1/.keep
diff --git a/src/problem1/index.js b/src/problem1/index.js
@@ -0,0 +1,24 @@
+// Time Complexity: O(1)
+// Space Complexity: O(1)
+function sum_to_n_a(n) {
+  return (n * (n + 1)) / 2;
+};
+
+// Time Complexity: O(n)
+// Space Complexity: O(n)
+function sum_to_n_b(n) {
+  return Array.from({ length: n }, (_, i) => i + 1).reduce((acc, curr) => acc + curr, 0);
+};
+
+// Time Complexity: O(n)
+// Space Complexity: O(n)
+function sum_to_n_c(n) {
+  if (n <= 0) return 0;
+  return n + sum_to_n_c(n - 1);
+};
+
+module.exports = {
+  sum_to_n_a,
+  sum_to_n_b,
+  sum_to_n_c,
+};
diff --git a/src/problem1/tests.js b/src/problem1/tests.js
@@ -0,0 +1,27 @@
+const assert = require('assert');
+const { sum_to_n_a, sum_to_n_b, sum_to_n_c } = require('./index');
+
+function expectedSum(n) {
+  let sum = 0;
+  for (let i = 1; i <= n; i++) {
+    sum += i;
+  }
+  return sum;
+}
+
+// Test values (feel free to add more)
+const testValues = [0, 1, 2, 5, 10, 100, 1000];
+
+function runTests() {
+  testValues.forEach((n) => {
+    const expected = expectedSum(n);
+
+    assert.strictEqual(sum_to_n_a(n), expected, `sum_to_n_a failed for n=${n}`);
+    assert.strictEqual(sum_to_n_b(n), expected, `sum_to_n_b failed for n=${n}`);
+    assert.strictEqual(sum_to_n_c(n), expected, `sum_to_n_c failed for n=${n}`);
+  });
+
+  console.log('All tests passed!');
+}
+
+runTests();
diff --git a/src/problem2/.gitignore b/src/problem2/.gitignore
@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
diff --git a/src/problem2/README.md b/src/problem2/README.md
@@ -0,0 +1,16 @@
+# Token Swap Interface
+
+A React-based cryptocurrency token swap interface built with TypeScript and Vite.
+
+## Requirements
+
+- Node.js 22+
+
+## Development
+
+```bash
+npm run dev      # Start dev server
+npm run build    # Build for production
+npm run test     # Run tests
+npm run lint     # Run linter
+```
diff --git a/src/problem2/components.json b/src/problem2/components.json
@@ -0,0 +1,20 @@
+{
+  "$schema": "https://ui.shadcn.com/schema.json",
+  "style": "default",
+  "rsc": false,
+  "tsx": true,
+  "tailwind": {
+    "config": "tailwind.config.ts",
+    "css": "src/index.css",
+    "baseColor": "slate",
+    "cssVariables": true,
+    "prefix": ""
+  },
+  "aliases": {
+    "components": "@/components",
+    "utils": "@/lib/utils",
+    "ui": "@/components/ui",
+    "lib": "@/lib",
+    "hooks": "@/hooks"
+  }
+}
diff --git a/src/problem2/eslint.config.js b/src/problem2/eslint.config.js
@@ -0,0 +1,23 @@
+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import tseslint from 'typescript-eslint'
+import { globalIgnores } from 'eslint/config'
+
+export default tseslint.config([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      js.configs.recommended,
+      tseslint.configs.recommended,
+      reactHooks.configs['recommended-latest'],
+      reactRefresh.configs.vite,
+    ],
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: globals.browser,
+    },
+  },
+])
diff --git a/src/problem2/index.html b/src/problem2/index.html
@@ -1,27 +1,13 @@
-<html>
-
-<head>
-  <meta name="viewport" content="width=device-width, initial-scale=1">
-  <title>Fancy Form</title>
-
-  <!-- You may add more stuff here -->
-  <link href="style.css" rel="stylesheet" />
-</head>
-
-<body>
-
-  <!-- You may reorganise the whole HTML, as long as your form achieves the same effect. -->
-  <form onsubmit="return !1">
-    <h5>Swap</h5>
-    <label for="input-amount">Amount to send</label>
-    <input id="input-amount" />
-
-    <label for="output-amount">Amount to receive</label>
-    <input id="output-amount" />
-
-    <button>CONFIRM SWAP</button>
-  </form>
-  <script src="script.js"></script>
-</body>
-
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Fancy Form</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
 </html>