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Artemis: Refactor and Optimize Prime Number Utilities #60

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Artemis: Refactor and Optimize Prime Number Utilities #60

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14 changes: 10 additions & 4 deletions app/src/main/java/algorithms/Primes.java
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Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
package algorithms;
import java.util.List;
import java.util.ArrayList;
import java.util.Vector;

public class Primes {
Expand Down Expand Up @@ -28,11 +30,15 @@ public static boolean IsPrime(int n) {
*/
public static int SumPrimes(int n) {
int sum = 0;
for (int i = 0; i < n; i++) {
List<Integer> primes = new ArrayList<>();
for (int i = 2; i <= n; i++) {
if (IsPrime(i)) {
sum = sum + i;
primes.add(i);
}
}
for (int p : primes) {
sum += p;
}
return sum;
}

Expand All @@ -42,8 +48,8 @@ public static int SumPrimes(int n) {
* @param n The number to find the prime factors of.
* @return An vector of all prime factors of n.
*/
public static Vector<Integer> PrimeFactors(int n) {
Vector<Integer> ret = new Vector<Integer>();
public static List<Integer> PrimeFactors(int n) {
List<Integer> ret = new ArrayList<>();

for (int i = 2; i * i <= n; i++) { // Optimized loop condition
while (n % i == 0 && IsPrime(i)) { // Optimized to handle repeated factors
Expand Down