@@ -0,0 +1,39 @@
+package leetcodeEasyLevel;
+
+public class _0326PowerofThree {
+  public static boolean isPowerOfThree(int n) {
+    //3의 배수인지 불리언타입으로 출력하기
+    //sol1. 구글링해도 내 코드가 제일 Runtime빠른듯
+    //Runtime 11 ms Memory 39.3 MB
+    /*
+    if(n == 0) return false;
+    if(n == 1) return true;
+
+    while(n >= 3){
+      if(n == 3) return true;
+      if(n%3 == 0){
+        n = n/3;
+      }else{
+        return false;
+      }
+    }
+    return false;
+    */
+
+    //sol2 Runtime 22 ms Memory 43.6 MB
+    if(n == 0) return false;
+    while(n % 3 == 0) {
+      n/=3;
+    }
+    return n == 1;
+  }
+
+  public static void main(String[] args) {
+    System.out.println(isPowerOfThree(27)+", ans: true");
+    System.out.println(isPowerOfThree(0)+", ans: false");
+    System.out.println(isPowerOfThree(9)+", ans: true");
+    System.out.println(isPowerOfThree(45)+", ans: false");
+    System.out.println(isPowerOfThree(1)+", ans: true");
+    System.out.println(isPowerOfThree(3)+", ans: true");
+  }
+}