g0501_0600.s0507_perfect_number.Solution Maven / Gradle / Ivy
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Java Solution for LeetCode algorithm problems, continually updating
package g0501_0600.s0507_perfect_number;
// #Easy #Math #2022_07_24_Time_2_ms_(80.46%)_Space_41.5_MB_(9.33%)
public class Solution {
public boolean checkPerfectNumber(int num) {
int s = 1;
for (int sq = (int) Math.sqrt(num); sq > 1; sq--) {
if (num % sq == 0) {
s += sq + (num / sq);
}
}
return num != 1 && s == num;
}
}