1007.js

/** ------------------------------------------------------------------------------
 * 
 * 1007. Minimum Domino Rotations For Equal Row
 * Topics: Array, Greedy
 * https://leetcode.com/problems/minimum-domino-rotations-for-equal-row/description/?envType=daily-question&envId=2025-05-03
 * 
 ------------------------------------------------------------------------------ */
/**
 * @param {number[]} tops
 * @param {number[]} bottoms
 * @return {number}
 */
var minDominoRotations = function (tops, bottoms) {
  const minRot = (target) => {
    let toTop = 0,
      toBottom = 0
    for (let i = 0; i < tops.length; i++) {
      const x = tops[i],
        y = bottoms[i]
      if (x !== target && y !== target) {
        return Infinity
      }
      if (x !== target) {
        toTop++
      } else if (y !== target) {
        toBottom++
      }
    }
    return Math.min(toTop, toBottom)
  }

  const ans = Math.min(minRot(tops[0]), minRot(bottoms[0]))
  return ans === Infinity ? -1 : ans
}

console.log(minDominoRotations([2, 1, 2, 4, 2, 2], [5, 2, 6, 2, 3, 2]))