How to check if the last index of an array is reachable by jumping based on element values from index 0 in Java

1 Answer

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public class JumpArray {

    public static boolean canReachLastIndex(int[] arr) {
        int size = arr.length;
        int currentIndex = 0;

        while (currentIndex < size) {
            // If we reach the last index, return true
            if (currentIndex == size - 1) {
                return true;
            }

            // If jump goes out of bounds, stop
            if (currentIndex + arr[currentIndex] >= size) {
                return false;
            }

            // Move to the next index by jumping
            currentIndex += arr[currentIndex];
        }

        return false;
    }

    public static void main(String[] args) {
        int[] arr = {2, 3, 1, 1, 4};

        if (canReachLastIndex(arr)) {
            System.out.println("Yes, we can reach the last index.");
        } else {
            System.out.println("No, we cannot reach the last index.");
        }
    }
}



/*
run:

Yes, we can reach the last index.

*/

 



answered Dec 1, 2025 by avibootz

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