Practice LeetCode-style problems under 30-45 min time limit. Speed comes from pattern recognition and clean implementation.

• LeetCode-style problems under 30-45 min time limit

function twoSum(nums, target) {
  const map = {};
  for (let i = 0; i < nums.length; i++) {
    const complement = target - nums[i];
    if (complement in map) return [map[complement], i];
    map[nums[i]] = i;
// ...

• Two Sum works

• Time management: 5 min read, 15 min code, 10 min test/optimize
• Brute force first (O(n²)), then optimize to hash map (O(n))
• Practice to improve speed; clean code beats fast code

Practice LeetCode-style problems under 30-45 min time limit. Speed comes from pattern recognition and clean implementation.

• LeetCode-style problems under 30-45 min time limit

function twoSum(nums, target) {
  const map = {};
  for (let i = 0; i < nums.length; i++) {
    const complement = target - nums[i];
    if (complement in map) return [map[complement], i];
    map[nums[i]] = i;
// ...

• Two Sum works

• Time management: 5 min read, 15 min code, 10 min test/optimize
• Brute force first (O(n²)), then optimize to hash map (O(n))
• Practice to improve speed; clean code beats fast code