add #13 #14 python implement

notes/面试总结.md

@@ -1016,6 +1016,40 @@ private void initDigitSum() {
 }
 ```
 
+```python
+# -*- coding:utf-8 -*-
+class Solution:
+    def __init__(self):
+        self.acc = 0
+        
+    def movingCount(self, threshold, rows, cols):
+        # write code here
+        self.threshold = threshold
+        self.rows = rows
+        self.cols = cols
+        self.board = [[0 for _ in range(cols)] for _ in range(rows)]
+        
+        self.traverse(0,0)
+        return self.acc
+    
+    def block(self, r, c):
+            s = sum(map(int,str(r)+str(c)))
+            return s>self.threshold
+        
+    def traverse(self, r, c):
+            if not (0<=r<self.rows and 0<=c<self.cols): return
+            if self.board[r][c]!=0: return
+            if self.board[r][c]==-1 or self.block(r,c):
+                self.board[r][c]=-1
+                return
+            self.board[r][c] = 1
+            self.acc += 1
+            self.traverse(r+1,c)
+            self.traverse(r-1,c)
+            self.traverse(r,c+1)
+            self.traverse(r,c-1)
+```
+
 # 14. 剪绳子
 
 [Leetcode](https://leetcode.com/problems/integer-break/description/)
@@ -1069,6 +1103,21 @@ public int integerBreak(int n) {
 }
 ```
 
+```python
+def integerBreak(n):
+    if n < 2:
+        return 0
+    if n == 2:
+        return 1
+    if n == 3:
+        return 2
+    timesOf3 = n // 3
+    if n - timesOf3 * 3 == 1:
+        timesOf3 -= 1
+    timesOf2 = (n - timesOf3 * 3) // 2
+    return pow(3, timesOf3) * pow(2, timesOf2)
+```
+
 # 参考文献
 
 - 何海涛. 剑指 Offer[M]. 电子工业出版社, 2012.