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project euler 12, java
//I can't believe it's just that small import java.util.*; import java.lang.*; class Rextester { public static void main(String args[]) { int num = 0; for (int i = 1; ; i++) { num += i; // num is triangle number i if (countDivisors(num) > 500) { System.out.println(Integer.toString(num)); return; } } } private static int countDivisors(int n) { int count = 0; int end = (int)Math.sqrt(n); for (int i = 1; i < end; i++) { if (n % i == 0) count += 2; } if (n % end == 0) // Perfect square count++; return count; } }
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