441. Arranging Coins

You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly k coins.

Given n, find the total number of full staircase rows that can be formed.

n is a non-negative integer and fits within the range of a 32-bit signed integer.

Example 1:

n = 5

The coins can form the following rows:
¤
¤ ¤
¤ ¤

Because the 3rd row is incomplete, we return 2.

Example 2:

n = 8

The coins can form the following rows:
¤
¤ ¤
¤ ¤ ¤
¤ ¤

Because the 4th row is incomplete, we return 3.
 

class Solution {
    public int arrangeCoins(int n) {
        int i=1;
        while(n>=0){
            n -= i;
            i++;
        }
        return i-2;
    }
}

喜欢的话订阅一个呗~第一时间收到文章更新哟~

发表评论

电子邮件地址不会被公开。