/Java/Position of an element in infinite sorted array

Position of an element in infinite sorted array

public class InfiniteArray {
  /*
  as the given array is infinite size, we need to find the range,
  where the target element lies.
  we exponentially double the size and checks if the target element greater
  than the array[end]. if true we return the boundaries as new start and end.
  */
  
    public static int[] FindRange(int[] array, int target) {
        int[] ranges = new int[2];
        int start = 0;
        int end = 1;
        while (target > array[end]) {
            int newStart = end+1;
            end = end + (end-start+1)*2;
            start = newStart;
        }
        ranges[0] = start;
        ranges[1] = end;
        return ranges;
    }
    public static int BinarySearch(int[] array, int target) {
        int[] rangeArray = FindRange(array, target);
        int start = rangeArray[0];
        int end = rangeArray[1];

        while (start <= end) {
            int mid = start + (end-start) / 2;
            if (array[mid] < target) start = mid+1;
            else end = mid-1;
            if (array[mid] == target) return mid;
        }
        return -1;
    }
    public static void main(String[] args) {
        int[] list  = new int[]{3, 5, 7, 9, 10, 90, 100, 130, 140, 160, 170};
        System.out.println(BinarySearch(list, 10)); // Output: 4
    }
}

Similar codes

0 vote183 views1 answer
String tmp java
Java
0 vote175 views1 answer
Currency Formatter java
Java
10 votes182 views3 answers
String to long java
Java
33 votes196 views5 answers
From string to double java
Java
1 vote180 views1 answer
Java run main of another class
Java
11 votes176 views6 answers
How to get current date time in android
Java
0 vote285 views5 answers
Android multiimage view
Java
0 vote216 views1 answer
How to sort a interable in java
Java
1 vote186 views2 answers
Komplettes array ausgeben java
Java
1 vote271 views1 answer
Java swing pic
Java