754. Reach a Number LeetCode Solution | Easy Approach

Minimum Cost to Merge Stones
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Reach a Number You are standing at position 0 on an infinite number line. There is a destination at position target.

You can make some number of moves numMoves so that:

  • On each move, you can either go left or right.
  • During the ith move (starting from i == 1 to i == numMoves), you take i steps in the chosen direction.

Given the integer target, return the minimum number of moves required (i.e., the minimum numMoves) to reach the destination.

Example 1:

Input: target = 2
Output: 3
Explanation:
On the 1st move, we step from 0 to 1 (1 step).
On the 2nd move, we step from 1 to -1 (2 steps).
On the 3rd move, we step from -1 to 2 (3 steps).

Example 2:

Input: target = 3
Output: 2
Explanation:
On the 1st move, we step from 0 to 1 (1 step).
On the 2nd move, we step from 1 to 3 (2 steps).

Constraints:

  • -109 <= target <= 109
  • target != 0

Reach a Number Solutions

Time: O(n)
Space: O(n)

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