Find max and min value by recursion

This commit is contained in:
shellhub 2019-09-28 16:26:10 +08:00
parent ff6b5c7634
commit 5043f89df6
2 changed files with 64 additions and 0 deletions

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package Maths;
public class FindMaxRecursion {
public static void main(String[] args) {
int[] array = {2, 4, 9, 7, 19, 94, 5};
int low = 0;
int high = array.length - 1;
System.out.println("max value is " + max(array, low, high));
}
/**
* Get max of array using divide and conquer algorithm
*
* @param array contains elements
* @param low the index of the first element
* @param high the index of the last element
* @return max of {@code array}
*/
public static int max(int[] array, int low, int high) {
if (low == high) {
return array[low]; //or array[high]
}
int mid = (low + high) >>> 1;
int leftMax = max(array, low, mid); //get max in [low, mid]
int rightMax = max(array, mid + 1, high); //get max in [mid+1, high]
return leftMax >= rightMax ? leftMax : rightMax;
}
}

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package Maths;
public class FindMinRecursion {
public static void main(String[] args) {
int[] array = {2, 4, 9, 7, 19, 94, 5};
int low = 0;
int high = array.length - 1;
System.out.println("min value is " + min(array, low, high));
}
/**
* Get min of array using divide and conquer algorithm
*
* @param array contains elements
* @param low the index of the first element
* @param high the index of the last element
* @return min of {@code array}
*/
public static int min(int[] array, int low, int high) {
if (low == high) {
return array[low]; //or array[high]
}
int mid = (low + high) >>> 1;
int leftMin = min(array, low, mid); //get min in [low, mid]
int rightMin = min(array, mid + 1, high); //get min in [mid+1, high]
return leftMin <= rightMin ? leftMin : rightMin;
}
}