1535. Find the Winner of an Array Game
Description
Given an integer array arr
of distinct integers and an integer k
.
A game will be played between the first two elements of the array (i.e. arr[0]
and arr[1]
). In each round of the game, we compare arr[0]
with arr[1]
, the larger integer wins and remains at position 0
, and the smaller integer moves to the end of the array. The game ends when an integer wins k
consecutive rounds.
Return the integer which will win the game.
It is guaranteed that there will be a winner of the game.
Example 1:
Input: arr = [2,1,3,5,4,6,7], k = 2 Output: 5 Explanation: Let's see the rounds of the game: Round | arr | winner | win_count 1 | [2,1,3,5,4,6,7] | 2 | 1 2 | [2,3,5,4,6,7,1] | 3 | 1 3 | [3,5,4,6,7,1,2] | 5 | 1 4 | [5,4,6,7,1,2,3] | 5 | 2 So we can see that 4 rounds will be played and 5 is the winner because it wins 2 consecutive games.
Example 2:
Input: arr = [3,2,1], k = 10 Output: 3 Explanation: 3 will win the first 10 rounds consecutively.
Constraints:
2 <= arr.length <= 105
1 <= arr[i] <= 106
arr
contains distinct integers.1 <= k <= 109
Solutions
Solution 1: Quick Thinking
We notice that each time the first two elements of the array are compared, regardless of the result, the next comparison will always be between the next element in the array and the current winner. Therefore, if we have looped $n-1$ times, the final winner must be the maximum element in the array. Otherwise, if an element has won consecutively $k$ times, then this element is the final winner.
The time complexity is $O(n)$, where $n$ is the length of the array. The space complexity is $O(1)$.
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