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Author: assassint2017

Permutation Sequence/Permutation_Sequence.py

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+# 按位确定
+# 40ms 84.01%
+class Solution:
+    def getPermutation(self, n, k):
+        """
+        :type n: int
+        :type k: int
+        :rtype: str
+        """
+        def factorial(num):
+            if num is 0:
+                return 1
+            else:
+                return num * factorial(num - 1)
+            
+        res_list = ''
+        temp_list = list(range(1, n + 1))
+        k -= 1
+        
+        while n > 0:
+            temp = factorial(n - 1)
+            res_list += str(temp_list[k // temp])
+            del temp_list[k // temp]
+            k = k - k // temp * temp
+            n -= 1
+
+        return res_list