416. 分割等和子集 ​

/**
 * @param {number[]} nums
 * @return {boolean}
 */
var canPartition = function (nums) {
  const sum = nums.reduce((p, v) => p + v);
  if (sum & 1) return false;
  const dp = new Array(sum / 2 + 1).fill(0);
  // 遍历物品
  for (let i = 0; i < nums.length; i++) {
    for (let j = sum / 2; j >= nums[i]; j--) {
      dp[j] = Math.max(dp[j], dp[j - nums[i]] + nums[i]);
      if (dp[j] === sum / 2) {
        return true;
      }
    }
  }
  return dp[sum / 2] === sum / 2;
};

/**
 * @param {number[]} nums
 * @return {boolean}
 */
var canPartition = function (nums) {
  const sum = nums.reduce((p, v) => p + v);
  if (sum & 1) return false;
  const dp = new Array(sum / 2 + 1).fill(0);
  // 遍历物品
  for (let i = 0; i < nums.length; i++) {
    for (let j = sum / 2; j >= nums[i]; j--) {
      dp[j] = Math.max(dp[j], dp[j - nums[i]] + nums[i]);
      if (dp[j] === sum / 2) {
        return true;
      }
    }
  }
  return dp[sum / 2] === sum / 2;
};