Do 'similar questions' to daily

Author: Zanger67

my-submissions/e231 v2.py

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+class Solution:
+    def isPowerOfTwo(self, n: int) -> bool:
+        return n > 0 and bin(n).count('1') == 1

my-submissions/e231.py

@@ -0,0 +1,3 @@
+class Solution:
+    def isPowerOfTwo(self, n: int) -> bool:
+        return n >= 1 and (n == 1 or n // 2 * 2 == n and self.isPowerOfTwo(n // 2))

my-submissions/e326 v2.py

@@ -0,0 +1,11 @@
+class Solution:
+    def isPowerOfThree(self, n: int) -> bool:
+        if n <= 0 :
+            return False
+        while n != 1 :
+            prev = n
+            n //= 3
+            if n * 3 != prev :
+                return False
+
+        return True

my-submissions/e326 v3.py

@@ -0,0 +1,3 @@
+class Solution:
+    def isPowerOfThree(self, n: int) -> bool:
+        return n >= 1 and (n == 1 or n // 3 * 3 == n and self.isPowerOfThree(n // 3))

my-submissions/e326.py

@@ -0,0 +1,3 @@
+class Solution:
+    def isPowerOfThree(self, n: int) -> bool:
+        return n > 0 and n == 3 ** int(log(n, 3) + 0.0001)

my-submissions/e342 v2 bitmanipulation.py

@@ -0,0 +1,6 @@
+class Solution:
+    def isPowerOfFour(self, n: int) -> bool:
+        return n == 1 or \
+               n > 0 and (bin(n)[2:][-2:].count('1') == 0) \
+                     and (bin(n)[-3:1:-2].count('1') == 1) \
+                     and (bin(n)[-4:1:-2].count('1') == 0)

my-submissions/e342.py

@@ -0,0 +1,3 @@
+class Solution:
+    def isPowerOfFour(self, n: int) -> bool:
+        return n >= 1 and (n == 1 or n // 4 * 4 == n and self.isPowerOfFour(n // 4))