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In this section, we will see one interesting problem. There are N coins. we have to find what is the max height we can make if we arrange the coins as pyramid. In this fashion, the first row will hold 1 coin, second will hold 2 coins and so on.

In the given diagram, we can see to make a pyramid of height three we need minimum 6 coins. We cannot make height 4 until we have 10 coins. Now let us see how to check the maximum height.

We can get the height by using this formula.

#include<iostream> #include<cmath> using namespace std; int getMaxHeight(int n) { int height = (-1 + sqrt(1 + 8 * n)) / 2; return height; } main() { int N; cout << "Enter number of coins: " ; cin >> N; cout << "Height of pyramid: " << getMaxHeight(N); }

Enter number of coins: 13 Height of pyramid: 4

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