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740. Delete and Earn 👍

  • Time: $O(n)$
  • Space: $O(10001) = O(1)$
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class Solution {
 public:
  int deleteAndEarn(vector<int>& nums) {
    // Reduce to 198. House Robber
    vector<int> bucket(10001);

    for (const int num : nums)
      bucket[num] += num;

    int prev1 = 0;
    int prev2 = 0;

    for (const int num : bucket) {
      const int dp = max(prev1, prev2 + num);
      prev2 = prev1;
      prev1 = dp;
    }

    return prev1;
  }
};

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class Solution {
  public int deleteAndEarn(int[] nums) {
    // Reduce to 198. House Robber
    int[] bucket = new int[10001];

    for (final int num : nums)
      bucket[num] += num;

    int prev1 = 0;
    int prev2 = 0;

    for (final int num : bucket) {
      final int dp = Math.max(prev1, prev2 + num);
      prev2 = prev1;
      prev1 = dp;
    }

    return prev1;
  }
}