2020-10-05

Author: JiayangWu

0718.最长重复子数组/0718-最长重复子数组.py

@@ -0,0 +1,19 @@
+class Solution(object):
+    def findLength(self, A, B):
+        """
+        :type A: List[int]
+        :type B: List[int]
+        :rtype: int
+        """
+        # dp[i][j] represents A[:i + 1], B[:j + 1] longest common subarray length
+        dp = [[0 for _ in range(len(B) + 1)] for _ in range(len(A) + 1)]
+
+        res = 0
+
+        for i in range(1, len(A) + 1):
+            for j in range(1, len(B) + 1):
+                if A[i - 1] == B[j - 1]:
+                    dp[i][j] = max(dp[i][j], dp[i - 1][j - 1] + 1)
+                    res = max(dp[i][j], res)
+        # print dp
+        return res

0811.子域名访问计数/0811-子域名访问计数.py

@@ -4,23 +4,19 @@ def subdomainVisits(self, cpdomains):
         :type cpdomains: List[str]
         :rtype: List[str]
         """
-        resList = []
-        resMap = {}
-        for s in cpdomains:
-            count, domains = s.split(' ')
-            n = domains.count('.')
-            tmp = domains
-            for i in range(n+1):
-                if resMap.has_key(tmp):
-                    resMap[tmp] = resMap[tmp] + int(count)
-                else:
-                    resMap[tmp] = int(count)
-                index = tmp.find('.') + 1
-                if index == -1:
-                    break
-                else:
-                    tmp = tmp[index:]
-        # for key, value in resMap.items():
-        #     resList.append(str(value) + ' ' + key);
-        # return resList
-        return [str(resMap[key]) + ' ' + key for key in resMap]
+        from collections import defaultdict
+        dic = defaultdict(int)
+
+        for pair in cpdomains:
+            splitted_pair = pair.split()
+            cnt, domain = splitted_pair[0], splitted_pair[1]
+            cnt = int(cnt)
+
+            for i in range(len(domain)):
+                if not i or domain[i] == ".":
+                    dic[domain[i:].lstrip(".")] += cnt
+
+        res = []
+        for domain, frequency in dic.items():
+            res.append(" ".join([str(frequency), domain]))
+        return res