Practise Coding
Mon July 10, 2017 LeetCode #1, #2, #3 accepted. #3 small Dynamic Programming.
Tue July 11, 2017 #95, #96 accepted. This is the DP and the tree problem.
Wed July 12, 2017 #5 Palindromic string problem. #55 Greedy problem accepted.
Thu July 13, 2017 #4 is very difficult, redo on July 27. #450 is annoying, redo on July 20.
Fri July 14, 2017 #155 is tricky for the min Stack. #377 is solved on my own, cool~.
Sun July 15, 2017 #23 use mergeSort and PriorityQueue. #121 Dynamic Programming problem.
Mon July 17, 17 #215, quicksort-like problem. #32 can use stack, dp.
Thu July 20, 17 redo the #450. #56 interval probelm. #108 bst probelm recursion
Fri July 21, 17 Difficult #297 redo on July 28
Sat July 22, 17 fuck today and do some easy problems for fun. -.- -> ^.^
Mon July 24, 17 #315 is quite interesting. Redo on July 31. #416 is an important typical dp backpack probelem.
Tue July 25, 17 #42 hard problem can be solve by two pointers effectively.
Wed July 26, 17 #287 find the entry of the loop in LinkedList. #310 BFS problem, important.
Thu July 27, 17 #448 Array how to make marker? Redo on Agust 4th. Finished redo the #4 median problem.
Sat July 29, 17 #239 Queue problem. Important. Redo on August 12th.
Mon July 31, 17 #337 Very good DFS & tree thinking problem.
Tue Agu 1, 17 #543 is similar to the #337. Tree Problem. #102 Tree level travel problem.
Wed Aug 2, 17 #560 is interesting, HashMap Problem use space to trade for time. #34 Range searching problem. #72 very typical problem, Redo on 9th Aug.
Thu Aug 3, 17 #152 continuous maximum product subarray problem.
Mon Aug 7, 17 #136 is very simple XOR problem. As the fun start of a day. #17 is another backtracking problem, similar to the permutation and also solved by prefix.
Tue Aug 8, 17 #142 Remind you how to detect a cycle in a linkedlist and how to find the entry point of a linkedlist. Still two pointer solution. #221 is another dp problem. Do not have any idea at the first time. Redo on Aug 15th.
Wed Aug 9, 17 Finished redo #72. #15 Three sum problem. Redo #15 on Aug 23rd. #169 is good to remind me for the partitioning.
Thu Aug 10, 17 #565 is an interesting problem. ArrayNesting problem. #494 is very important DFS problem. Redo on Aug 17th.
Fri Aug 11, 17 #547 DFS or UnionFind Problem.
Mon Aug 14, 17 #621 annoying problem. Redo on Aug 28th.
Tue Aug 15, 17 #10 is difficult. Redo on Aug 22nd. #139 is very good dp thinking problem. Redo on Aug 29th.
Wed Aug 16, 17 #39 is very good backtraking problem. can use both prefix and backtrack to do. Redo on 30 Aug. Finished Redo #221.
Thu Aug 17, 17 #79 is the silimar backtrack problem and there is one key sentence. Redo this on 31st Aug.
Fri Aug 18, 17 #437 is the very difficult easy problem. DFS and DP. Redo on 1st Sep. #75 i think is good for practise thinking.
Sun Aug 19, 17 #421 is those fucking genius can think out.. i can not. Bit manipulation problem. #78 backtracking problem , prefix problem.
Mon Aug 21, 17 #336 Palindrome problem.
Tue Aug 22, 17 #22 back-tracking problem cannot sovel myself. Redo on Sep 4th.
Wed Aug 23, 17 #583 dp problem. #394 can solved by two stack. #207 is the topological sort problem.
Thu Aug 24, 17 #300 dp problem. It is not a mergesort problem. #647 is dp problem.
Fri Aug 25, 17 #114 Tree Traversal problem. Redo on Aug 9th. #236 Tree Problem. Redo Aug 9th.
Sat Aug 26, 17 #148 mergesort to sort a linkedlist. #283 move zero problem. Good Problem.
Wed Aug 30, 17 #146 LRU Cache problem. Remember, hashMap, dLinkedNode, moveTohead, addNode, popTail, removeNode.
Thu Aug 31, 17 #208 Tire - Prefix Tree Problem. Nothing difficult, just dont be afraid.
Fri Sep 1st, 17 #211 is another Trie Problem.
Sat Sep 2nd, 17 #212 is a very good dfs and Trie Problem. Redo Sep 9.
Mon Sep 4th, 17 #128 is HashMap Problem.
Tue Sep 5th, 17 #76 is a very important problem. Redo on Sep 14.
Wed Sep 6th, 17 #3 redo. using the standard counter, two pointer method.
Thu Sep 7th, 17 #572 tree traverse problem. Redo on Sep 15th. #101 tree traverse problem. #209 similary to #76, #3, two pointer to solve sub-arry problems.
Fri Sep 8th, 17 #8 atoi problem. #234 Palindrome LinkedList Problem.
Sat Sep 9th, 17 #50 is pow problem. Notice in java 0 - Integer.min = Integer.min.
Sun Sep 10th, 17 #289 is not a difficult problem. Keep courage and confidence is very important. Dont be afraid, Just do it kaishen.
Mon Sep 11th, 17 #395 divide and conquer. Redo 25th Sep.
Wen Sep 13th, 17 #44 dp problem. Optional Redo Sep 26th.
Fri Sep 15th, 17 #227 Stack problem, Redo Sep 30th.
Mon Sep 18th, 17 #166 totally cannot do it.
Tue Sep 19th, 17 #7 reverse integer. Dont be afraid. keep courage
Wed Sep 20th, 17 #84 cannot sovle it myself. Redo this 4th Oct
Thu Sep 21th, 17 #347 can be solved by hashmap method. Also learn how to sort a map by its value.
Fri Sep 22th, 17 #91 hashmap problem. Redo on Oct 4 with dp method.
Sun Sep 23th, 17 #54 Spiral Matrix problem. Dont like this kind of question.
Mon Sep 25th, 17 #66 plus one question. There is still better solution
Wed Sep 27th, 17 #127 is very difficult BFS problem. Proving that the searching speed of set is much faster.
Fri Sep 29th, 17 #48 rotate the matrix in-place. #202 Digit-problem, happy number.
Sun Oct 8th, 17 #69 newtownd's method.
Mon Oct 9th, 17 #344 esay problem.