2270.js

/** ------------------------------------------------------------------------------
 * 
 * 2270. Number of Ways to Split Array
 * Topics: Prefix Sum
 * https://leetcode.com/problems/number-of-ways-to-split-array/?envType=daily-question&envId=2025-01-03
 * 
 ------------------------------------------------------------------------------ */
/**
 * @param {number[]} nums
 * @return {number}
 */
var waysToSplitArray = function (nums) {
  let n = nums.length
  let answer = 0

  const prefix = new Array(n)
  prefix[0] = nums[0]

  for (let i = 1; i < n; i++) {
    prefix[i] = prefix[i - 1] + nums[i]
  }

  for (let i = 0; i < n - 1; i++) {
    if (prefix[i] >= prefix[n - 1] - prefix[i]) {
      answer++
    }
  }

  return answer
}

console.log(waysToSplitArray([10, 4, -8, 7]))

// 변수명 깔끔하넹
var waysToSplitArray = function (nums) {
  let ways = 0
  const prefix = new Array(nums.length)
  prefix[0] = nums[0]
  for (let i = 1; i < nums.length; i++) {
    prefix[i] = prefix[i - 1] + nums[i]
  }

  for (let i = 0; i < prefix.length - 1; i++) {
    const first = prefix[i] - 0
    const second = prefix[prefix.length - 1] - prefix[i]

    if (first >= second) ways++
  }

  return ways
}