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1665. Minimum Initial Energy to Finish Tasks 👍

  • Time: $O(\texttt{sort})$
  • Space: $O(\texttt{sort})$
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class Solution {
 public:
  int minimumEffort(vector<vector<int>>& tasks) {
    int ans = 0;
    int prevSaved = 0;

    ranges::sort(tasks, ranges::greater{},
                 [](const vector<int>& task) { return task[1] - task[0]; });

    for (const vector<int>& task : tasks) {
      const int actual = task[0];
      const int minimum = task[1];
      if (prevSaved < minimum) {
        ans += minimum - prevSaved;
        prevSaved = minimum - actual;
      } else {
        prevSaved -= actual;
      }
    }

    return ans;
  }
};

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class Solution {
  public int minimumEffort(int[][] tasks) {
    int ans = 0;
    int prevSaved = 0;

    Arrays.sort(tasks, Comparator.comparingInt(task -> task[0] - task[1]));

    for (int[] task : tasks) {
      final int actual = task[0];
      final int minimum = task[1];
      if (prevSaved < minimum) {
        ans += minimum - prevSaved;
        prevSaved = minimum - actual;
      } else {
        prevSaved -= actual;
      }
    }

    return ans;
  }
}

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class Solution:
  def minimumEffort(self, tasks: list[list[int]]) -> int:
    ans = 0
    prevSaved = 0

    for actual, minimum in sorted(tasks, key=lambda x: x[0] - x[1]):
      if prevSaved < minimum:
        ans += minimum - prevSaved
        prevSaved = minimum - actual
      else:
        prevSaved -= actual

    return ans