Algorithm
Problem Name: 326. Power of Three
Given an integer n, return true if it is a power of three. Otherwise, return false.
An integer n is a power of three, if there exists an integer x such that n == 3x.
Example 1:
Input: n = 27 Output: true Explanation: 27 = 33
Example 2:
Input: n = 0 Output: false Explanation: There is no x where 3x = 0.
Example 3:
Input: n = -1 Output: false Explanation: There is no x where 3x = (-1).
Constraints:
-231 <= n <= 231 - 1
Code Examples
#1 Code Example with C Programming
Code -
C Programming
bool isPowerOfThree(int n) {
#if 0
if (n == 1) return true;
if (n == 0 || n % 3) return false;
return isPowerOfThree(n / 3);
#else
return (n > 0 && (1162261467 % n) == 0);
#endif
}
Input
n = 27
Output
true
#2 Code Example with Java Programming
Code -
Java Programming
class Solution {
public boolean isPowerOfThree(int n) {
int left = 0;
int right = n / 3;
while (left < = right) {
int mid = (left + right) / 2;
double powValue = Math.pow(3, mid);
if (powValue == n) {
return true;
}
if (powValue > n) {
right = mid - 1;
} else {
left = mid + 1;
}
}
return false;
}
}
Input
n = 27
Output
true
#3 Code Example with Javascript Programming
Code -
Javascript Programming
const isPowerOfThree = function(n) {
const maxInt = Math.pow(3,30)
if(n < 0> {
return false
}
return maxInt % n === 0
}
Input
n = 0
Output
false
#4 Code Example with Python Programming
Code -
Python Programming
class Solution:
def isPowerOfThree(self, n: int) -> bool:
i = 1
while i < n:
i *=3
return i == n
Input
n = 0
Output
false
#5 Code Example with C# Programming
Code -
C# Programming
namespace LeetCode
{
public class _0326_PowerOfThree
{
public bool IsPowerOfThree(int n)
{
return n > 0 && 1162261467 % n == 0;
}
}
}
Input
n = -1
Output
false