呀，天亮了
May 22, 2020 01:58:24 AM
https://leetcode.com/problems/maximum-product-subarray/
Given an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product.
Example 1:
Input: [2,3,-2,4]
Output: 6
Explanation: [2,3] has the largest product 6.
Example 2:
Input: [-2,0,-1] Output: 0 Explanation: The result cannot be 2, because [-2,-1] is not a subarray.
May 22, 2020 01:05:56 AM
https://leetcode.com/problems/count-square-submatrices-with-all-ones/
Given a m * n matrix of ones and zeros, return how many square submatrices have all ones.
Example 1:
Input: matrix = [ [0,1,1,1], [1,1,1,1], [0,1,1,1] ] Output: 15 Explanation: There are 10 squares of side 1. There are 4 squares of side 2. There is 1 square of side 3. Total number of squares = 10 + 4 + 1 = 15.
May 21, 2020 06:35:19 AM
https://leetcode.com/problems/equal-tree-partition/
Given a binary tree with n nodes, your task is to check if it's possible to partition the tree to two trees which have the equal sum of values after removing exactly one edge on the original tree.
Example 1:
Input:
5
/ \
10 10
/ \
2 3
Output: True
Explanation:
5
/
10
Sum: 15
10
/ \
2 3
Sum: 15
May 21, 2020 05:42:37 AM
https://leetcode.com/problems/find-elements-in-a-contaminated-binary-tree/
Given a binary tree with the following rules:
root.val == 0treeNode.val == x and treeNode.left != null, then treeNode.left.val == 2 * x + 1treeNode.val == x and treeNode.right != null, then treeNode.right.val == 2 * x + 2
Now the binary tree is contaminated, which means all treeNode.val have been changed to -1.
You need to first recover the binary tree and then implement the FindElements class:
FindElements(TreeNode* root) Initializes the object with a contamined binary tree, you need to recover it first.bool find(int target) Return if the target value exists in the recovered binary tree.
Example 1:
Input ["FindElements","find","find"] [[[-1,null,-1]],[1],[2]] Output [null,false,true] Explanation FindElements findElements = new FindElements([-1,null,-1]); findElements.find(1); // return False findElements.find(2); // return True
May 20, 2020 06:43:49 AM
https://leetcode.com/problems/next-permutation/
Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.
If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order).
The replacement must be in-place and use only constant extra memory.
Here are some examples. Inputs are in the left-hand column and its corresponding outputs are in the right-hand column.
1,2,3 → 1,3,2
3,2,1 → 1,2,3
1,1,5 → 1,5,1
May 20, 2020 05:16:36 AM
https://leetcode.com/problems/daily-temperatures/
Given a list of daily temperatures T, return a list such that, for each day in the input, tells you how many days you would have to wait until a warmer temperature. If there is no future day for which this is possible, put 0 instead.
For example, given the list of temperatures T = [73, 74, 75, 71, 69, 72, 76, 73], your output should be [1, 1, 4, 2, 1, 1, 0, 0].
Note: The length of temperatures will be in the range [1, 30000]. Each temperature will be an integer in the range [30, 100].
May 20, 2020 01:50:01 AM
https://leetcode.com/problems/online-stock-span/
Write a class StockSpanner which collects daily price quotes for some stock, and returns the span of that stock's price for the current day.
The span of the stock's price today is defined as the maximum number of consecutive days (starting from today and going backwards) for which the price of the stock was less than or equal to today's price.
For example, if the price of a stock over the next 7 days were [100, 80, 60, 70, 60, 75, 85], then the stock spans would be [1, 1, 1, 2, 1, 4, 6].
Example 1:
Input: ["StockSpanner","next","next","next","next","next","next","next"], [[],[100],[80],[60],[70],[60],[75],[85]] Output: [null,1,1,1,2,1,4,6] Explanation: First, S = StockSpanner() is initialized. Then: S.next(100) is called and returns 1, S.next(80) is called and returns 1, S.next(60) is called and returns 1, S.next(70) is called and returns 2, S.next(60) is called and returns 1, S.next(75) is called and returns 4, S.next(85) is called and returns 6. Note that (for example) S.next(75) returned 4, because the last 4 prices (including today's price of 75) were less than or equal to today's price.
May 19, 2020 05:30:07 AM
https://leetcode.com/problems/permutation-in-string/
Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string's permutations is the substring of the second string.
Example 1:
Input: s1 = "ab" s2 = "eidbaooo"
Output: True
Explanation: s2 contains one permutation of s1 ("ba").
Example 2:
Input:s1= "ab" s2 = "eidboaoo" Output: False
May 18, 2020 01:19:49 AM
https://leetcode.com/problems/find-all-anagrams-in-a-string/
Given a string s and a non-empty string p, find all the start indices of p's anagrams in s.
Strings consists of lowercase English letters only and the length of both strings s and p will not be larger than 20,100.
The order of output does not matter.
Example 1:
Input: s: "cbaebabacd" p: "abc" Output: [0, 6] Explanation: The substring with start index = 0 is "cba", which is an anagram of "abc". The substring with start index = 6 is "bac", which is an anagram of "abc".
May 16, 2020 06:25:50 AM
https://leetcode.com/problems/longest-substring-with-at-most-k-distinct-characters/
Given a string, find the length of the longest substring T that contains at most k distinct characters.
Example 1:
Input: s = "eceba", k = 2 Output: 3 Explanation: T is "ece" which its length is 3.
Example 2:
Input: s = "aa", k = 1 Output: 2 Explanation: T is "aa" which its length is 2.
