diff options
Diffstat (limited to 'check_num_sum_pow3.py')
-rw-r--r-- | check_num_sum_pow3.py | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/check_num_sum_pow3.py b/check_num_sum_pow3.py new file mode 100644 index 0000000..b931e50 --- /dev/null +++ b/check_num_sum_pow3.py @@ -0,0 +1,29 @@ +# 1780. Check if Number is a Sum of Powers of Three + +""" +given an integer 'n', return true if it is possible to represent 'n' as the +sum of distinct powers of three. otherwise, return false. an integer 'y' is a +power of three if there exists an integer 'x' such that 'y == 3^x' +""" + + +class Solution(object): + def checkPowersOfThree(self, n): + """ + :type n: int + :rtype: bool + """ + pow3 = [3**i for i in reversed(range(15))] + for i in pow3: + if n >= 2 * i: + return False + elif n >= i: + n -= i + return True + + +if __name__ == "__main__": + obj = Solution() + print(obj.checkPowersOfThree(12)) + print(obj.checkPowersOfThree(91)) + print(obj.checkPowersOfThree(21)) |