441. Arranging Coins (Leetcode || Java || Easy)

Palakkgoyal
2 min readOct 26, 2022

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.

Constraints:

  • 1 <= n <= 231 - 1

SOLUTION:

class Solution {
public int arrangeCoins(int n) {
int count = 0;//counting number of steps n will cover
int i = 1;

while(n > 0){
n = n — i;//eliminating steps

i++;
count++;

if(n == 0){//if n becomes 0 it means the last step is also filled
return count;
}
}

return count — 1;//n do no become zero in the last hence, we do not consider the last step
}
}

Thank you for reading. If you have any queries, please let me know int the comment section.

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Palakkgoyal

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