定个小目标，刷个300题

Day 21: 2021-04-08

Review Day:
[69] Sqrt(x) - E
[34] Find First and Last Position of Element in Sorted Array - M
[81] Search in Rotated Sorted Array II - M
[50] Pow(x, n) - M
[162] Find Peak Element - M
[209] Minimum Size Subarray Sum - M (revisit needed)

Day 22: 2021-04-09

Review Day:
[240] Search a 2D Matrix II - M
[387] First Unique Character in a String - E
[120] Triangle
[287] Find the Duplicate Number
[4] Median of Two Sorted Arrays  - H
除了最后一题其他都能一遍pass！

打了疫苗后昏睡两天，偷懒了两天
Day 23: 2021-04-12
仔细学了binary search，感觉豁然开朗

Day 24: 20221-04-13

367        Valid Perfect Square        Binary Search        E
875        Koko Eating Bananas        Binary Search        M

Num of Q solved: 112 -> 114

Day 25: 2021-04-19

34        Find First and Last Position of Element in Sorted Array        Binary Search        upper/lower bound        M
704        Binary Search        Binary Search        find target        E
981        Time Based Key-Value Store        Binary Search        upper/lower bound        M
1011        Capacity To Ship Packages Within D Days        Binary Search        guess and check        M
1482        Minimum Number of Days to Make m Bouquets        Binary Search        guess and check        M

Num of Q solved: 114 -> 118

Day 26: 2021-04-20

912        Sort an Array        Quick Sort        partition        E
215        Kth Largest Element in an Array        K-select        partition        M
378        Kth Smallest Element in a Sorted Matrix        Binary Search        kth + matrix        M
Num of Q solved: 118 -> 121
继续binary search，重点看了看quick sort + quick select

第一个月结束： 2021-03-18 - 2021-04-20
Num of Q solved: 74 -> 121 (47 questions)
重点攻克backtracking和binary search
中间偷懒了一周左右？

668        Kth Smallest Number in Multiplication Table        Binary Search        kth + matrix        H
719        Find K-th Smallest Pair Distance        Binary Search        kth + sliding window         H
Num of Q solved: 121 -> 123
继续binary search，稍微涉及到了sliding window，明天要重点看看sliding window和复习


补充内容 (2021-04-24 12:41 +8:00):
Day 27: 2021-04-22

Day 28: 2021-04-23
76        Minimum Window Substring        Sliding Window                M
567        Permutation in String        Sliding Window                M

Num of Q solved: 123 -> 125
看了看sliding window，接下来准备主攻这个topic

Day 29: 2021-04-26

786        K-th Smallest Prime Fraction        Binary Search        kth        H
11        Container With Most Water        Two Pointer                M
167        Two Sum II - Input array is sorted        Two Pointer                E
3        Longest Substring Without Repeating Characters        Two Pointer                M

Num of Q solved: 125 -> 127