假設我們有一個數組,其中包含n個元素,從1到n的順序被打亂。給定另一個整數K。有N個人排隊打羽毛球。前兩個玩家將去打球,然後失敗者將去排隊的末尾。勝者將與隊列中的下一個人比賽,依此類推。他們將一直打球,直到有人連續贏得K次。然後該選手成為勝者。
如果隊列是[2, 1, 3, 4, 5],K = 2,那麼輸出將是5。現在來看看解釋:
(2, 1)比賽,2獲勝,所以1將被加入隊列中,隊列變為[3, 4, 5, 1] (2, 3)比賽,3獲勝,所以2將被添加到隊列中,隊列變為[4, 5, 1, 2] (3, 4)比賽,4獲勝,所以3將被添加到隊列中,隊列變為[5, 1, 2, 3] (4, 5)比賽,5獲勝,所以4將被添加到隊列中,隊列變為[1, 2, 3, 4] (5, 1)比賽,5獲勝,所以3將被添加到隊列中,隊列變為[2, 3, 4, 1]
(2, 1)比賽,2獲勝,所以1將被添加到隊列中,隊列變為[3, 4, 5 , 1]
(2, 3)比賽,3獲勝,所以2將被加入隊列中,隊列變成[4, 5, 1, 2]
(3, 4 )比賽,4獲勝,所以3將被添加到隊列中,隊列變為[5, 1, 2, 3]
(4, 5)比賽,5獲勝,所以4將被添加到隊列中,隊列變為[1, 2, 3, 4]
(5, 1)比賽,5獲勝,所以3將被添加到隊列中,隊列變為[2, 3, 4, 1 ]
由於5連續贏得兩場比賽,所以輸出是5。
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
#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); }
3
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