剑指offer 64.滑动窗口的最大值

 1 import java.util.ArrayList;
 2 public class Solution {
 3     public ArrayList<Integer> maxInWindows(int [] num, int size)
 4     {
 5         ArrayList<Integer> list = new ArrayList<Integer>();
 6         if(num == null || num.length == 0 || size == 0){
 7             return list;
 8         }
 9         // 双重循环，算法复杂度为O(nk), k 为窗口大小
10         int max = -1 << 30;
11         for(int i = 0; i < num.length - size + 1; i++){
12             max = num[i];
13             for(int j = i + 1; j < num.length && j < i + size; j++){
14                 max = (max > num[j]) ? max : num[j];
15             }
16             list.add(max);
17         }
18         return list;
19     }
20 }