缺大米的请参加这个刷题/Mock interview活动

18天 3 题

#第十天打卡 今天刷了五道题，最后一道hard写了我俩小时！不过最后没有看答案靠自己写出来还是很有成就感的，而且事后总结了之后理解就更清晰到位了。今天让我调试到吐血的是有两个类型为HashMap<Character, Integer>的map1和map2，我通过map1.get(a)==map2.get(b)进行比较，结果跑半天都楞是没能满足这个比较条件。后来才发现get()的返回类型Integer的==比较是类似于String的，也就是说比较的是reference而非value，所以得改成map1.get(a).equals(map2.get(a))才行。说真的，这次调试把我给弄的怀疑人生了。

6.19
Day?
今日四题

逐渐恢复状态… 加油！

19

leetcode new 5 review10+
间歇性脑子转不动。。。佩服大神们。。
236. Lowest Common Ancestor of a Binary Tree
recursion做，就四行代码，但是自己还是想不出

468. Validate IP Address
如果有三个点，就尝试验证ipv4，如果有七个冒号，就尝试验证ipv6，题目和reallife有区别

384. Shuffle an Array
用到了Fisher-Yates algorithm， 不是很懂原理

92. Reverse Linked List II
移动pointer，正常reverse逻辑，再连接

642. Design Search Autocomplete System
buildtrie和pq

Design Search Autocomplete System   5 minutes ago
AcceptedjavaReverse Linked List II   1 hour, 56 minutes ago
AcceptedjavaReverse Linked List II   1 hour, 57 minutes ago
AcceptedjavaReverse Linked List II   2 hours, 33 minutes ago
AcceptedjavaReverse Linked List II   2 hours, 36 minutes ago
AcceptedjavaReverse Linked List II   2 hours, 40 minutes ago
AcceptedjavaReverse Linked List II   2 hours, 44 minutes ago
AcceptedjavaReverse Linked List II   3 hours, 12 minutes ago
AcceptedjavaDesign Search Autocomplete System   4 hours, 10 minutes ago
AcceptedjavaDesign Search Autocomplete System   5 hours, 55 minutes ago
AcceptedjavaDesign Search Autocomplete System   5 hours, 55 minutes ago
AcceptedjavaReverse Linked List II   5 hours, 57 minutes ago
AcceptedjavaShuffle an Array   6 hours, 6 minutes ago
AcceptedjavaValidate IP Address   6 hours, 12 minutes ago
AcceptedjavaValidate IP Address   6 hours, 17 minutes ago
Compile ErrorjavaValidate IP Address   6 hours, 17 minutes ago
AcceptedjavaLowest Common Ancestor of a Binary Tree   6 hours, 37 minutes ago
AcceptedjavaLowest Common Ancestor of a Binary Tree   6 hours, 38 minutes ago
AcceptedjavaAll Nodes Distance K in Binary Tree   6 hours, 55 minutes ago
AcceptedjavaPopulating Next Right Pointers in Each Node II   6 hours, 55 minutes ago

day 16
6 道tree
recursion 终于顺手了起来。。
需要静下心来多看看别人的解法

第二天  坚持坚持坚持

坚持第1天
6 道题

Day 18 五道题

Day 12

3 accepted, 1 attempted