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  1. import java.util.*;
  2. import java.lang.*;
  3.  
  4. class Main
  5. {
  6.     public static int largestTriangleNumberSmallerThan(int x) {
  7.         int n = (int) (Math.sqrt(8*x + 1) - 1)/2;
  8.         return n*(n+1)/2;
  9.     }
  10.  
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		System.out.println(largestTriangleNumberSmallerThan(65));
  14. 	}
  15. }
Success #stdin #stdout 0.07s 380160KB
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https://ideone.com/1qBHfX
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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