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55. Jump Game
Given an array of non-negative integers, you are initially positioned at the first index of the array.
Each element in the array represents your maximum jump length at that position.
Determine if you are able to reach the last index.
Example 1:
Input: [2,3,1,1,4] Output: true Explanation: Jump 1 step from index 0 to 1, then 3 steps to the last index.
Example 2:
Input: [3,2,1,0,4]
Output: false
Explanation: You will always arrive at index 3 no matter what. Its maximum
jump length is 0, which makes it impossible to reach the last index.
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/**
* Runtime: 1 ms, faster than 99.35% of Java online submissions for Jump Game.
*
* Memory Usage: 37.7 MB, less than 100.00% of Java online submissions for Jump Game.
*/
public boolean canJump(int[] nums) {
if (Objects.isNull(nums) || nums.length <= 1) {
return true;
}
int lenght = nums.length;
int tail = lenght - 1;
for (int i = tail - 1; i >= 0; i--) {
if (nums[i] >= tail - i || nums[i] >= lenght - 1 - i) {
tail = i;
}
}
return tail <= 0;
}
// TODO: Backtracking
// TODO: Dynamic Programming Top-down
// TODO: Dynamic Programming Bottom-up