使用单步移动k的数组元素?
假设我们有一个数组,其中的n个元素从1到n按随机顺序排列。给出另一个整数K。他们正在排队的N人打羽毛球。前两个玩家将参加比赛,然后输家将在排行榜的最后排位。获胜者将与队列中的下一个人一起玩,依此类推。他们将一直玩到有人连续赢得K次为止。然后,该玩家成为赢家。
如果队列是[2,1,3,4,5]且K=2,则输出将为5。现在看说明-
(2,1)出局,2获胜,因此将1添加到队列中,Queue就像[3,4,5,1](2,3)出局,3获胜,因此2将添加到队列中,队列就像[4,5,1,2,2](3,4)播放,4胜,所以3将被添加到队列中,队列就像[5,1,2,3](4,5)播放,5胜,所以4将被添加到队列中,Queue就像[1、2、3、4](5,1)播放,5胜,所以3将被添加到队列中,Queue像[2,3,4,1]
(2,1)出局,2获胜,因此1将被添加到队列中,Queue就像[3,4,5,1]
(2,3)出局,3胜,所以2将被添加到队列中,Queue就像[4,5,1,2]
(3,4)出局,4胜,所以3将被添加到队列中,Queue就像[5,1,2,3]
(4,5)出局,5获胜,因此4将被添加到队列中,队列类似于[1,2,3,4]
(5,1)出局,5获胜,因此3将被添加到队列中,Queue类似于[2,3,4,1]
因为5赢得了两个连续比赛,那么输出为5。
算法
优胜者(arr,n,k)
Begin
if k >= n-1, then return n
best_player := 0
win_count := 0
for each element e in arr, do
if e > best_player, then
best_player := e
if e is 0th element, then
win_count := 1
end if
else
increase win_count by 1
end if
if win_count >= k, then
return best player
done
return best player
End示例
#include <iostream>
using namespace std;
int winner(int arr[], int n, int k) {
if (k >= n - 1) //if K exceeds the array size, then return n
return n;
int best_player = 0, win_count = 0; //initially best player and win count is not set
for (int i = 0; i < n; i++) { //for each member of the array
if (arr[i] > best_player) { //when arr[i] is better than the best one, update best
best_player = arr[i];
if (i) //if i is not the 0th element, set win_count as 1
win_count = 1;
}else //otherwise increase win count
win_count += 1;
if (win_count >= k) //if the win count is k or more than k, then we have got result
return best_player;
}
return best_player; //otherwise max element will be winner.
}
main() {
int arr[] = { 3, 1, 2 };
int n = sizeof(arr) / sizeof(arr[0]);
int k = 2;
cout << winner(arr, n, k);
}输出结果
3