JumpGame.java

package greedy;

/**
 * Created by gouthamvidyapradhan on 17/03/2017.
 * Given an array of non-negative integers, you are initially positioned at the first index of the array.
 * <p>
 * Each element in the array represents your maximum jump length at that position.
 * <p>
 * Determine if you are able to reach the last index.
 * <p>
 * For example:
 * A = [2,3,1,1,4], return true.
 * <p>
 * A = [3,2,1,0,4], return false.
 */
public class JumpGame {
    /**
     * Main method
     *
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        int[] nums = {1, 2, 1, 0, 4};
        System.out.println(new JumpGame().canJump(nums));
    }

    public boolean canJump(int[] nums) {
        if (nums.length == 0) return false;
        int min = nums.length - 1, max = nums.length - 1;
        for (int i = nums.length - 2; i >= 0; i--) {
            if ((nums[i] + i) >= min)
                min = i;
        }
        return (min == 0);
    }
}