#1047 - Remove All Adjacent Duplicates In String

Easy • View on LeetCode • View on GitHub

Problem Description

You are given a string s consisting of lowercase English letters. A duplicate removal consists of choosing two adjacent and equal letters and removing them.

We repeatedly make duplicate removals on s until we no longer can.

Return the final string after all such duplicate removals have been made. It can be proven that the answer is unique.

Solution

/**
 * @param {string} s
 * @return {string}
 */
var removeDuplicates = function(s) {
  const stack = [];

  for (const char of s) {
    stack[stack.length - 1] === char ? stack.pop() : stack.push(char);
  }

  return stack.join('');
};