Simulate a 60-minute coding interview. Solve 1-2 problems of medium difficulty. Record yourself to review communication.

• Simulate a 60-minute coding interview

function lengthOfLongestSubstring(s) {
  const charIndex = {};
  let maxLength = 0;
  let start = 0;
  
  for (let end = 0; end < s.length; end++) {
// ...

• Longest substring found
• Handles all repeated

• Sliding window: two pointers for current window
• HashMap: track last index of each character
• When duplicate found: move start past previous occurrence

Simulate a 60-minute coding interview. Solve 1-2 problems of medium difficulty. Record yourself to review communication.

• Simulate a 60-minute coding interview

function lengthOfLongestSubstring(s) {
  const charIndex = {};
  let maxLength = 0;
  let start = 0;
  
  for (let end = 0; end < s.length; end++) {
// ...

• Longest substring found
• Handles all repeated

• Sliding window: two pointers for current window
• HashMap: track last index of each character
• When duplicate found: move start past previous occurrence