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43 lines (38 loc) · 960 Bytes
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Copy pathPrimeNumber.java
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43 lines (38 loc) · 960 Bytes
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public class PrimeNumber {
public static void main(String[] args) {
System.out.println(isPrime(6));
System.out.println(isPrime1(7));
}
/**
* Time O(n)
* Space Input O(1)
* Space Auxiliary O(1)
* @param n input
*/
private static boolean isPrime(int n) {
if (n <= 1) return false;
int numberOfDivisor = 0;
for (int i = 1; i <= n; i++) {
if (n % i == 0) {
numberOfDivisor++;
}
}
return numberOfDivisor == 2;
}
/**
* Time O(sqrt n)
* Space Input O(1)
* Space Auxiliary O(n)
* @param n input
*/
private static boolean isPrime1(int n) {
if (n <= 1) return false;
int numberOfDivisor = 0;
for (int i = 2; i <= (int) Math.sqrt(n); i++) {
if (n % i == 0) {
numberOfDivisor++;
}
}
return numberOfDivisor == 0;
}
}