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p092.java
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49 lines (38 loc) · 890 Bytes
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/*
* Solution to Project Euler problem 92
* Copyright (c) Project Nayuki. All rights reserved.
*
* https://www.nayuki.io/page/project-euler-solutions
* https://github.com/nayuki/Project-Euler-solutions
*/
public final class p092 implements EulerSolution {
public static void main(String[] args) {
System.out.println(new p092().run());
}
private static final int LIMIT = Library.pow(10, 7);
public String run() {
int count = 0;
for (int i = 1; i < LIMIT; i++) {
if (isClass89(i))
count++;
}
return Integer.toString(count);
}
private static boolean isClass89(int x) {
while (true) {
switch (x) {
case 1: return false;
case 89: return true;
default: x = nextNumber(x);
}
}
}
private static int nextNumber(int x) {
int sum = 0;
while (x != 0) {
sum += (x % 10) * (x % 10);
x /= 10;
}
return sum;
}
}