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2383. Minimum Hours of Training to Win a Competition

  • Time: $O(n)$
  • Space: $O(1)$
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class Solution {
 public:
  int minNumberOfHours(int initialEnergy, int initialExperience,
                       vector<int>& energy, vector<int>& experience) {
    return getRequiredEnergy(initialEnergy, energy) +
           getRequiredExperience(initialExperience, experience);
  }

 private:
  int getRequiredEnergy(int initialEnergy, const vector<int>& energy) {
    return max(0,
               accumulate(begin(energy), end(energy), 0) + 1 - initialEnergy);
  }

  int getRequiredExperience(int currentExperience,
                            const vector<int>& experience) {
    int requiredExperience = 0;
    for (const int e : experience) {
      if (e >= currentExperience) {
        requiredExperience += e + 1 - currentExperience;
        currentExperience += e + 1 - currentExperience;
      }
      currentExperience += e;
    }
    return requiredExperience;
  }
};
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class Solution {
  public int minNumberOfHours(int initialEnergy, int initialExperience, int[] energy,
                              int[] experience) {
    return getRequiredEnergy(initialEnergy, energy) +
        getRequiredExperience(initialExperience, experience);
  }

  private int getRequiredEnergy(int initialEnergy, int[] energy) {
    return Math.max(0, Arrays.stream(energy).sum() + 1 - initialEnergy);
  }

  private int getRequiredExperience(int currentExperience, int[] experience) {
    int requiredExperience = 0;
    for (final int e : experience) {
      if (e >= currentExperience) {
        requiredExperience += e + 1 - currentExperience;
        currentExperience += e + 1 - currentExperience;
      }
      currentExperience += e;
    }
    return requiredExperience;
  }
}
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class Solution:
  def minNumberOfHours(self, initialEnergy: int, initialExperience: int, energy: List[int], experience: List[int]) -> int:
    return self._getRequiredEnergy(initialEnergy, energy) + \
        self._getRequiredExperience(initialExperience, experience)

  def _getRequiredEnergy(self, initialEnergy: int, energy: List[int]) -> int:
    return max(0, sum(energy) + 1 - initialEnergy)

  def _getRequiredExperience(self, currentExperience: int, experience: List[int]) -> int:
    requiredExperience = 0
    for e in experience:
      if e >= currentExperience:
        requiredExperience += e + 1 - currentExperience
        currentExperience += e + 1 - currentExperience
      currentExperience += e
    return requiredExperience