#309 Jump Game

Given an array nums where each element represents the maximum jump length at that position, determine if you can reach the last index starting from index 0.

Rules:

• Start at first position (index 0)
• At each position i, can jump up to nums[i] steps forward
• Must reach last index exactly
• Cannot jump backward

Constraints:

• 1 ≤ nums.length ≤ 1000
• 0 ≤ nums[i] ≤ 1000

Examples:

// Example 1:
console.log(canJump([1, 2, 0, 1, 0]));
// Output: true
// Explanation: Jump path: 0->1->3->4

// Example 2:
console.log(canJump([1, 2, 1, 0, 1]));
// Output: false
// Explanation: Can't reach last index