326. Power of Three
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1.递归
public class Solution { public boolean isPowerOfThree(int n) { if(n<=0) return false; if(n == 1) return true; if(n >= 3 && (n % 3) == 0 ) return isPowerOfThree(n/3); return false; }}
2^19 = 1162261467 < Integer.MAX_VALUE < 3^20
public class Solution { public boolean isPowerOfThree(int n) { if(n<=0) return false; return (1162261467 % n) == 0 ; }}
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- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
- 326. Power of Three
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