2965.js

/** ------------------------------------------------------------------------------
 * 
 * 2965. Find Missing and Repeated Values
 * Topics: Math
 * https://leetcode.com/problems/find-missing-and-repeated-values/?envType=daily-question&envId=2025-03-06
 * 
 ------------------------------------------------------------------------------ */
/**
 * @param {number[][]} grid
 * @return {number[]}
 */
var findMissingAndRepeatedValues = function (grid) {
  const n = grid.length
  const count = Array(n * n + 1).fill(0)
  let repeated = 0
  let missing = 0

  for (const row of grid) {
    for (const num of row) {
      count[num]++
      if (count[num] === 2) {
        repeated = num
      }
    }
  }

  for (let i = 1; i <= n * n; ++i) {
    if (count[i] === 0) {
      missing = i
      break
    }
  }

  return [repeated, missing]
}

console.log(
  findMissingAndRepeatedValues([
    [1, 3],
    [2, 2],
  ]),
)