Program to find minimum number of hops required to reach end position in Python

Suppose we have one array nums, where all elements are positive. We are at index 0. Here, each element in the array represents our maximum jump length at that position. Our goal is to reach to the final index (n-1, where n is size of nums) with less number of jumps. So if the array is like [2,3,1,1,4], and then the output will be 2, as we can jump to index 1 from 0, then jump to index 4, that is the last index.

To solve this, we will follow these steps −

• end := 0, jumps := 0, farthest := 0
• for i in range 0 to length of nums – 1
  • farthest := max of farthest and nums[i] + i
  • if i is end, and i is not length of nums – 1, then
    • increase jumps by 1
    • end := farthest
• return jumps

Let us see the following implementation to get better understanding −

Example

 Live Demo

class Solution(object):
   def jump(self, nums):
      end = 0
      jumps = 0
      farthest = 0
      for i in range(len(nums)):
         farthest = max(farthest,nums[i]+i)
         if i == end and i != len(nums)-1:
            jumps+=1
            end = farthest
      return jumps
ob = Solution()
print(ob.jump([3, 4, 3, 0, 1]))

Input

[3, 4, 3, 0, 1]

Output

2

Arnab Chakraborty

Updated on: 19-Oct-2020

424 Views

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