55 lines
1.5 KiB
Java
55 lines
1.5 KiB
Java
// Java program to implement Jump Search.
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public class JumpSearch
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{
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public static int jumpSearch(int[] arr, int x)
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{
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int n = arr.length;
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// Finding block size to be jumped
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int step = (int)Math.floor(Math.sqrt(n));
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// Finding the block where element is
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// present (if it is present)
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int prev = 0;
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while (arr[Math.min(step, n)-1] < x)
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{
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prev = step;
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step += (int)Math.floor(Math.sqrt(n));
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if (prev >= n)
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return -1;
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}
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// Doing a linear search for x in block
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// beginning with prev.
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while (arr[prev] < x)
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{
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prev++;
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// If we reached next block or end of
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// array, element is not present.
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if (prev == Math.min(step, n))
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return -1;
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}
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// If element is found
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if (arr[prev] == x)
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return prev;
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return -1;
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}
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// Driver program to test function
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public static void main(String [ ] args)
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{
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int arr[] = { 0, 1, 1, 2, 3, 5, 8, 13, 21,
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34, 55, 89, 144, 233, 377, 610};
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int x = 55;
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// Find the index of 'x' using Jump Search
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int index = jumpSearch(arr, x);
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// Print the index where 'x' is located
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System.out.println("\nNumber " + x +
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" is at index " + index);
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}
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} |