7月缺米的来刷题/Mock interview活动

Day 1
1. #724. Find Pivot Index (a) sum - leftSum - nums[i] == leftSum O(n) & O(1) (b) Sliding window: count += right - left + 1 O(n^2) & O(1)
2. #560. Subarray Sum Equals K (a) Brute force O(n^2) & O(1)   (b) prefixSum, HashMap O(n) & O(n) which sacrificing space for time.
3. #713. Subarray Product Less Than K (a) Brute force O(n^2) & O(1)  (b)

Array 三题。边界条件需要特殊注意。。

7.11 day6 July LeetCoding Challenge

7.11 打卡 contest 四题

1. Best Position for a Service center. 收获最大的一题，逐步逼近的方法很值得学习。推荐。
2. Path With Maximum Probability. PQ + BFS. 常规题。

7.11 Day1 打卡
#561 - Array Partition I

加油加油

打卡第二天

20200711:
3: 0039, 0040, 0046, 0047, 0131, 0787, 1514
4:
5:

day 8
今天没有mock 参加了lc周赛和kickstart

第四题保持做不出来记录。。。

周赛+复习 10+
Path with Maximum Probability   4 hours, 17 minutes ago
Compile ErrorjavaPath with Maximum Probability   4 hours, 19 minutes ago
AcceptedjavaPath with Maximum Probability   4 hours, 43 minutes ago
AcceptedjavaPath with Maximum Probability   5 hours, 20 minutes ago
Wrong AnswerjavaPath with Maximum Probability   5 hours, 32 minutes ago
Wrong AnswerjavaPath with Maximum Probability   5 hours, 55 minutes ago
AcceptedjavaNumber of Substrings With Only 1s   5 hours, 59 minutes ago
Time Limit ExceededjavaPath with Maximum Probability   6 hours ago
Wrong AnswerjavaNumber of Substrings With Only 1s   6 hours, 2 minutes ago
AcceptedjavaNumber of Good Pairs   6 hours, 9 minutes ago
AcceptedjavaLongest Duplicate Substring   9 hours, 18 minutes ago
AcceptedjavaValid Sudoku   9 hours, 52 minutes ago
AcceptedjavaValid Sudoku   9 hours, 53 minutes ago
AcceptedjavaValid Sudoku   9 hours, 59 minutes ago
AcceptedjavaValid Sudoku   10 hours, 1 minute ago
AcceptedjavaMaximize Distance to Closest Person   10 hours, 28 minutes ago
AcceptedjavaMaximum Sum of Two Non-Overlapping Subarrays   10 hours, 39 minutes ago
AcceptedjavaMaximum Sum of Two Non-Overlapping Subarrays   10 hours, 40 minutes ago
AcceptedjavaMaximum Sum of Two Non-Overlapping Subarrays   10 hours, 48 minutes ago
AcceptedjavaPath with Maximum Gold   11 hours, 19 minutes ago

我从二月开始刷题以来已经前后刷了400多题了。但是密集的时候一天刷十多刀，不密集的话每隔几天才刷几道。没有一个长期坚持的Plan。
看到这个刷题加米贴我考虑开始每天刷四道题。
现在正在刷FB的高频。还差一百多道题可以刷完半年的高频题。我估计坚持的话一个月刷完吧。
剩下的计划是，开始重刷我自己研究的归类模版上的题。打算刷完整理好之后分享出来。
昨天刷了这四道题（LeetCode）：
721 Accounts Merge
621 Task Scheduler
767 Reorganize String
380 Insert Delete GetRandom O(1)