441. Arranging Coins.cpp

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 full=0, i=1;
        while(n>=0){
            n-=i;
            if(n>=0) full++;
            i++;
        }
        return full;
    }
};