2026/04/16

[LeetCode] 213 House Robber II

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class Solution {
public:
  static constexpr int SIZE = 101;
  int dp(vector<int>& nums) {
    int x[SIZE];
    if (nums.size() == 1)
      return nums[0];
    x[0] = nums[0];
    x[1] = max(nums[0], nums[1]);
    for (int i = 2; i < nums.size(); i++)
      x[i] = max(x[i - 1], x[i - 2] + nums[i]);
    return x[nums.size() - 1];
  }

  int rob(vector<int>& nums) {
    if (nums.size() == 0) 
      return 0;
    if (nums.size() == 1) 
      return nums[0];
    if (nums.size() == 2)
      return max(nums[0], nums[1]);

    vector<int> nums1(nums.begin(), nums.end() - 1);
    vector<int> nums2(nums.begin() + 1, nums.end());
    int dp1 = dp(nums1);
    int dp2 = dp(nums2);
    return max(dp1, dp2);
  }
};