485_Max_Consecutive_Ones

qiyuangong · qiyuangong · commit 8ee7faa18dc0 · 2020-02-21T17:42:16.000+08:00
diff --git a/README.md b/README.md
@@ -156,8 +156,9 @@ Also, there are open source implementations for basic data structs and algorithm
 | 461 | [Hamming Distance](https://leetcode.com/problems/hamming-distance/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/461_Hamming_Distance.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/461_Hamming_Distance.java) | Hamming Distance is related to XOR for numbers. So, XOR then count 1. O(n) |
 | 463 | [Island Perimeter](https://leetcode.com/problems/island-perimeter/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/463_Island_Perimeter.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/463_Island_Perimeter.java) | math, find the area, actual number, then find the digit |
 | 475 | [Heaters](https://leetcode.com/problems/heaters/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/475_Heaters.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/475_Heaters.java) | 1. Binary search hourse in heater array, O(nlogn) and O(1)<br> 2. Two points, O(nlogn) and O(1) |
-| 479 | [Largest Palindrome Product](https://leetcode.com/problems/largest-palindrome-product/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/479_Largest_Palindrome_Product.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/479_Largest_Palindrome_Product.java) | 1. Product max palindrome than check, O(n^2) and O(1)<br>2. [Math](# https://leetcode.com/problems/largest-palindrome-product/discuss/96305/Python-Solution-Using-Math-In-48ms) |
+| 479 | [Largest Palindrome Product](https://leetcode.com/problems/largest-palindrome-product/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/479_Largest_Palindrome_Product.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/479_Largest_Palindrome_Product.java) | 1. Product max palindrome than check, O(n^2) and O(1)<br>2. [Math](https://leetcode.com/problems/largest-palindrome-product/discuss/96305/Python-Solution-Using-Math-In-48ms) |
 | 482 | [License Key Formatting](https://leetcode.com/problems/license-key-formatting/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/482_License_Key_Formatting.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/482_License_Key_Formatting.java) | String processing, lower and len % K, O(n) and O(n) |
+| 485 | [Max Consecutive Ones](https://leetcode.com/problems/max-consecutive-ones/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/485_Max_Consecutive_Ones.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/485_Max_Consecutive_Ones.java) | Add one when encounter 1, set to 0 when encounter 0, O(n) and O(1) |
 | 509 | [Fibonacci Number](https://leetcode.com/problems/fibonacci-number/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/509_Fibonacci_Number.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/509_Fibonacci_Number.java) | 1. Recursive, O(n) <br>2. DP with memo, O(n). Note that N<=30, which means that we can keep a memo from 0 to 30. |
 | 538 | [Convert BST to Greater Tree](https://leetcode.com/problems/convert-bst-to-greater-tree/description/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/538_Convert_BST_to_Greater_Tree.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/538_Convert_BST_to_Greater_Tree.java) | Right first DFS with a variable recording sum of node.val and right.val. 1. Recursive.<br>2. Stack 3. Reverse Morris In-order Traversal |
 | 543 | [Diameter of Binary Tree](https://leetcode.com/problems/diameter-of-binary-tree/description/) | [Python](https://github.com/qiyuangong/leetcode/blob/master/python/543_Diameter_of_Binary_Tree.py) [Java](https://github.com/qiyuangong/leetcode/blob/master/java/543_Diameter_of_Binary_Tree.java) | DFS with O(1) for max answer |
diff --git a/java/485_Max_Consecutive_Ones.java b/java/485_Max_Consecutive_Ones.java
@@ -0,0 +1,17 @@
+class Solution {
+    public int findMaxConsecutiveOnes(int[] nums) {
+        int ans = 0;
+        int curr = 0;
+        for (int i = 0; i < nums.length; i++) {
+            if (nums[i] == 1) {
+                // Add 1 when encounter 1
+                curr++;
+                if (curr > ans) ans = curr;
+            } else {
+                // Set to 0 when encounter 0
+                curr = 0;
+            }
+        }
+        return ans;
+    }
+}
diff --git a/python/485_Max_Consecutive_Ones.py b/python/485_Max_Consecutive_Ones.py
@@ -0,0 +1,18 @@
+class Solution(object):
+    def findMaxConsecutiveOnes(self, nums):
+        """
+        :type nums: List[int]
+        :rtype: int
+        """
+        ans = 0
+        curr = 0
+        for n in nums:
+            if n == 1:
+                # Add 1 to curr when encounter 1
+                curr += 1
+                if curr > ans:
+                    ans = curr
+            else:
+                # Add 1 to curr when encounter 1
+                curr = 0
+        return ans
