这可以使用 BST 解决。
首先对数组进行排序说 arr1
使用 arr1 的最后一个元素开始创建另一个 arr2（从 arr1 中删除此 ele）
现在：重复这些步骤，直到没有交换发生。
- 检查 arr1 是否有可以使用 BST 移动到 arr2 的元素，以使 diff 小于目前找到的 MIN diff。
- 如果我们找到一个元素，则将该元素移动到 arr2 并再次转到 step1。
- 如果我们在上述步骤中没有找到任何元素，请针对 arr2 和 arr1 执行步骤 1 和 2。
即现在检查 arr2 中是否有可以移动到 arr1 的元素
- 继续步骤 1-4，直到我们不需要任何交换为止..
- 我们找到了解决方案。
示例 Java 代码：
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Divide an array so that the difference between these 2 is min
*
* @author shaikhjamir
*
*/
public class DivideArrayForMinDiff {
/**
* Create 2 arrays and try to find the element from 2nd one so that diff is
* min than the current one
*/
private static int sum(List<Integer> arr) {
int total = 0;
for (int i = 0; i < arr.size(); i++) {
total += arr.get(i);
}
return total;
}
private static int diff(ArrayList<Integer> arr, ArrayList<Integer> arr2) {
int diff = sum(arr) - sum(arr2);
if (diff < 0)
diff = diff * -1;
return diff;
}
private static int MIN = Integer.MAX_VALUE;
private static int binarySearch(int low, int high, ArrayList<Integer> arr1, int arr2sum) {
if (low > high || low < 0)
return -1;
int mid = (low + high) / 2;
int midVal = arr1.get(mid);
int sum1 = sum(arr1);
int resultOfMoveOrg = (sum1 - midVal) - (arr2sum + midVal);
int resultOfMove = (sum1 - midVal) - (arr2sum + midVal);
if (resultOfMove < 0)
resultOfMove = resultOfMove * -1;
if (resultOfMove < MIN) {
// lets do the swap
return mid;
}
// this is positive number greater than min
// which mean we should move left
if (resultOfMoveOrg < 0) {
// 1,10, 19 ==> 30
// 100
// 20, 110 = -90
// 29, 111 = -83
return binarySearch(low, mid - 1, arr1, arr2sum);
} else {
// resultOfMoveOrg > 0
// 1,5,10, 15, 19, 20 => 70
// 21
// For 10
// 60, 31 it will be 29
// now if we move 1
// 71, 22 ==> 49
// but now if we move 20
// 50, 41 ==> 9
return binarySearch(mid + 1, high, arr1, arr2sum);
}
}
private static int findMin(ArrayList<Integer> arr1) {
ArrayList<Integer> list2 = new ArrayList<>(arr1.subList(arr1.size() - 1, arr1.size()));
arr1.remove(arr1.size() - 1);
while (true) {
int index = binarySearch(0, arr1.size(), arr1, sum(list2));
if (index != -1) {
int val = arr1.get(index);
arr1.remove(index);
list2.add(val);
Collections.sort(list2);
MIN = diff(arr1, list2);
} else {
// now try for arr2
int index2 = binarySearch(0, list2.size(), list2, sum(arr1));
if (index2 != -1) {
int val = list2.get(index2);
list2.remove(index2);
arr1.add(val);
Collections.sort(arr1);
MIN = diff(arr1, list2);
} else {
// no switch in both the cases
break;
}
}
}
System.out.println("MIN==>" + MIN);
System.out.println("arr1==>" + arr1 + ":" + sum(arr1));
System.out.println("list2==>" + list2 + ":" + sum(list2));
return 0;
}
public static void main(String args[]) {
ArrayList<Integer> org = new ArrayList<>();
org = new ArrayList<>();
org.add(1);
org.add(2);
org.add(3);
org.add(7);
org.add(8);
org.add(10);
findMin(org);
}
}