Find out if you can reach the last tile – Program Code

There are a number of tiles on the floor, each numbered with a different non-negative integer. Treat this set of tiles as an array. You are initially standing on the first tile. Each tile in the set represents your maximum jumping distance at that position. (Ex: If you are standing on 3 you can jump up to 3 tiles forward). Find out if you can reach the last tile.

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JavaScript Code: 

/**
 * There are a number of tiles on the floor, each
 * numbered with a different non-negative integer.
 * Treat this set of tiles as an array. You are 
 * initially standing on the firsrt tile. Each tile
 * in the set represents your maximum jumping distance
 * at that position. (Ex: If you are standing on 3 
 * you can jump up to 3 tiles forward). Find out if you
 * can reach the last tile.
 */
function can_reach_end(nums){
    let n = nums.length - 1
    for( let i = n - 1; i >= -1; i-- ){
        if( nums[i] + i >= n ) n = i
    }
    return n == 0
}

console.log(can_reach_end([1, 5, 10, 15]))

Output: 

true

 

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Python Code: 

def can_reach_end(nums):
    n = len(nums) - 1
    for i in range(n-1, -2, -1):
        if nums[i] + i >= n:
            n = i
    return n == 0

print(can_reach_end([1, 5, 10, 15]))

Output: 

True

 

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