算法Sedgewick第四版-第1章基础-1.4 Analysis of Algorithms-007按位置，找出数组相关最大值

Given an array a[] of N real numbers, design a linear-time algorithm to find the maximum value of a[j] - a[i] where j ≥ i.

 1 package algorithms.analysis14;
 2
 3 public class Best {
 4
 5     public static void main(String[] args) {
 6         double[] a = {5.0, 4.0, 3.0 ,6.0,1.0};
 7         int N = a.length;
 8         double best = 0.0;
 9         double min = a[0];
10         for (int i = 0; i < N; i++) {
11             min  = Math.min(a[i], min);
12             best = Math.max(a[i] - min, best);
13         }
14         System.out.println(best);
15         System.out.println(min);
16     }
17 }