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495. Teemo Attacking

Array Simulation

Problem - Teemo Attacking

Easy

Our hero Teemo is attacking an enemy Ashe with poison attacks! When Teemo attacks Ashe, Ashe gets poisoned for a exactly duration seconds. More formally, an attack at second t will mean Ashe is poisoned during the inclusive time interval [t, t + duration - 1]. If Teemo attacks again before the poison effect ends, the timer for it is reset, and the poison effect will end duration seconds after the new attack.

You are given a non-decreasing integer array timeSeries, where timeSeries[i] denotes that Teemo attacks Ashe at second timeSeries[i], and an integer duration.

Return the total number of seconds that Ashe is poisoned.

 

Example 1:

Input: timeSeries = [1,4], duration = 2
Output: 4
Explanation: Teemo's attacks on Ashe go as follows:
- At second 1, Teemo attacks, and Ashe is poisoned for seconds 1 and 2.
- At second 4, Teemo attacks, and Ashe is poisoned for seconds 4 and 5.
Ashe is poisoned for seconds 1, 2, 4, and 5, which is 4 seconds in total.

Example 2:

Input: timeSeries = [1,2], duration = 2
Output: 3
Explanation: Teemo's attacks on Ashe go as follows:
- At second 1, Teemo attacks, and Ashe is poisoned for seconds 1 and 2.
- At second 2 however, Teemo attacks again and resets the poison timer. Ashe is poisoned for seconds 2 and 3.
Ashe is poisoned for seconds 1, 2, and 3, which is 3 seconds in total.

 

Constraints:

  • 1 <= timeSeries.length <= 104
  • 0 <= timeSeries[i], duration <= 107
  • timeSeries is sorted in non-decreasing order.

Solutions

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class Solution:
    def findPoisonedDuration(self, timeSeries: List[int], duration: int) -> int:
        # result = duration
        # for atk1, atk2 in pairwise(timeSeries):
        #     result += min(duration, atk2 - atk1)
        # return result

        if len(timeSeries) == 0:
            return 0

        result = 0
        initial = timeSeries[0]
        end = initial + duration

        for time in timeSeries:
            if time >= end:
                result += end - initial
                initial = time
            end = time + duration

        result += end - initial
        return result

Submission Stats:

  • Runtime: 4 ms (97.64%)
  • Memory: 18.4 MB (99.64%)