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Commits on May 13, 2016

• Simplify Path: stack.

  DeanChensj

  committed
  fe85957

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• Range Sum 2D Immutable: DP.

  DeanChensj

  committed
  9921890

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Commits on May 4, 2016

• Integer Break: find the regularity...

  DeanChensj

  committed
  f41bacf

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• atoi: corner cases..

  DeanChensj

  committed
  8e136e9

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Commits on May 3, 2016

• .

  DeanChensj

  committed
  7568ccb

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Commits on May 2, 2016

• Num of Digit One: permutation & combination, classified discussion.

  DeanChensj

  committed
  e9af9bb

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• Reverse Vowels of a Str: 2 pointers.

  DeanChensj

  committed
  0529bac

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• Count Complete Tree Nodes: Binary Search, count the height of l-subTree & r-subTree, determine next step is..

  DeanChensj

  committed
  6eea05f

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• Excel Sheet Column: trivial, use %.

  DeanChensj

  committed
  8e863ae

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Commits on Apr 29, 2016

• Surrounded Regions: DFS, keep the recursion times to be minimal, chage the table inplace so we don't need to record isVisitedOrNot.

  DeanChensj

  committed
  ef37b4c

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Commits on Apr 28, 2016

• Largest Number: trick, use a+b > b+a as the compare function.

  DeanChensj

  committed
  345cf66

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• Game of Life: bit manipulation to achieve in-place operation.

  DeanChensj

  committed
  3634bd7

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Commits on Apr 27, 2016

• Valid Number: corner cases.

  DeanChensj

  committed
  4e017a0

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• Reverse Words in a Str: trivial.

  DeanChensj

  committed
  5c3ca7e

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• Binary Search Tree Iterator: in order traversal.

  DeanChensj

  committed
  9a12137

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• Reverse String: trivial.

  DeanChensj

  committed
  2d4b9a6

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Commits on Apr 26, 2016

• Integer to Roman: Trivial.

  DeanChensj

  committed
  1631dd3

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• Construct Binary Tree from In & Post: stack & recursive.

  DeanChensj

  committed
  b5040eb

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Commits on Apr 25, 2016

• Construct Binary-tree from pre & in: Stack or recursive, useroot to divide inorder sequence.

  DeanChensj

  committed
  c1b7db3

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Commits on Apr 17, 2016

• Multiply Strings: no big deal.

  DeanChensj

  committed
  b46132b

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Commits on Apr 14, 2016

• Perfect Squares: BFS, O(n), could use math & reduce to O(sqrt(n)).

  DeanChensj

  committed
  692552e

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Commits on Apr 11, 2016

• Copy List With Random Pointer: hahsmap, recursion.

  DeanChensj

  committed
  16ea231

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Commits on Apr 9, 2016

• Group Anagrams: Hash, sort string.

  DeanChensj

  committed
  d08a5e9

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• Group Anagrams: hash, sort string.

  DeanChensj

  committed
  59ae5a2

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• Single Number III: xor, try to partition all numbers into two groups.

  DeanChensj

  committed
  2e4442e

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• Largest Rect in Histogram: stack, track last histogram that no lower than cur height.

  DeanChensj

  committed
  d6a7ac3

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Commits on Apr 7, 2016

• LCA of Binary Tree: dfs.

  DeanChensj

  committed
  771d96d

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Commits on Apr 6, 2016

• Maximum Product Subarray: two pointers.

  DeanChensj

  committed
  d7793ba

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Commits on Apr 4, 2016

• Wildcard Matching: 2D DP, quite like edit distance, could be faster.

  DeanChensj

  committed
  d1fb3d6

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• Dungeon Game: DP & Greedy, start from the P, keep the health no higher than zero.

  DeanChensj

  committed
  71e4578

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Commits on Apr 2, 2016

• Basic Calculator II: stack and queue, should use vec to speed up...

  DeanChensj

  committed
  42ab0bd

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• Clone Graph: DFS, Hashmap maps initial node to newly created node.

  DeanChensj

  committed
  1b881a8

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Commits on Mar 31, 2016

• First Bad Version: binary search. mid = (l>>1)+(r>>1)+(l&r&1);

  DeanChensj

  committed
  580e59d

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Commits on Mar 30, 2016

• Decode Ways: DP solution, O(n).

  DeanChensj

  committed
  42dd429

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• Minimum Window Substr: hash(128 vec), use a counter to record the status, O(N)

  DeanChensj

  committed
  c90d247

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