441. Arranging Coins LeetCode Solution | Easy Approach

Minimum Cost to Merge Stones

Arranging Coins You have n coins and you want to build a staircase with these coins. The staircase consists of k rows where the ith row has exactly i coins. The last row of the staircase may be incomplete.

Given the integer n, return the number of complete rows of the staircase you will build.

Example 1:

Input: n = 5
Output: 2
Explanation: Because the 3rd row is incomplete, we return 2.

Example 2:

Input: n = 8
Output: 3
Explanation: Because the 4th row is incomplete, we return 3.


  • 1 <= n <= 231 - 1

Arranging Coins Solutions

Time: O(n)
Space: O(n)


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