1529-minimum-suffix-flips.js

/**
 * 1529. Minimum Suffix Flips
 * https://leetcode.com/problems/minimum-suffix-flips/
 * Difficulty: Medium
 *
 * You are given a 0-indexed binary string target of length n. You have another binary string s
 * of length n that is initially set to all zeros. You want to make s equal to target.
 *
 * In one operation, you can pick an index i where 0 <= i < n and flip all bits in the inclusive
 * range [i, n - 1]. Flip means changing '0' to '1' and '1' to '0'.
 *
 * Return the minimum number of operations needed to make s equal to target.
 */

/**
 * @param {string} target
 * @return {number}
 */
var minFlips = function(target) {
  let current = '0';
  let result = 0;

  for (const bit of target) {
    if (bit !== current) {
      result++;
      current = bit;
    }
  }

  return result;
};