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Leetcode 问题分类

2013-02-25 03:41:00.0 Leetcode Leetcode  
导读:http://leetcode.cloudfoundry.com/IdQuestionDifficultyFreqencyData StructuresAlgorithms1Two Sum25arraysetsorttwo pointers2Add Two Numbers34linked listtwo pointersmath3Longest Substring Without Repeatin...。。。

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IdQuestionDifficultyFreqencyData StructuresAlgorithms
1Two Sum25
  1. array
  2. set
  1. sort
  2. two pointers
2Add Two Numbers34
  1. linked list
  1. two pointers
  2. math
3Longest Substring Without Repeating Characters32
  1. string
  2. hashtable
  1. two pointers
4Median of Two Sorted Arrays53
  1. array
  1. binary search
5Longest Palindromic Substring42
  1. string
    6ZigZag Conversion31
    1. string
      7Reverse Integer23
        1. math
        8String to Integer (atoi)25
        1. string
        1. math
        9Palindrome Number22
          1. math
          10Regular Expression Matching53
          1. string
          1. recursion
          2. dp
          11Container With Most Water32
          1. array
          1. two pointers
          12Integer to Roman34
            1. math
            13Roman to Integer24
              1. math
              14Longest Common Prefix21
              1. string
                153Sum35
                1. array
                1. two pointers
                163Sum Closest31
                1. array
                1. two pointers
                17Letter Combinations of a Phone Number33
                1. string
                1. dfs
                184Sum32
                1. array
                  19Remove Nth Node From End of List23
                  1. linked list
                  1. two pointers
                  20Valid Parentheses25
                  1. string
                  1. stack
                  21Merge Two Sorted Lists25
                  1. linked list
                  1. sort
                  2. two pointers
                  3. merge
                  22Generate Parentheses34
                  1. string
                  1. dfs
                  23Merge k Sorted Lists34
                  1. linked list
                  2. heap
                  1. sort
                  2. two pointers
                  3. merge
                  24Swap Nodes in Pairs24
                  1. linked list
                    25Reverse Nodes in k-Group42
                    1. linked list
                    1. recursion
                    2. two pointers
                    26Remove Duplicates from Sorted Array13
                    1. array
                    1. two pointers
                    27Remove Element14
                    1. array
                    1. two pointers
                    28Implement strStr()45
                    1. string
                    1. two pointers
                    2. KMP
                    3. rolling hash
                    29Divide Two Integers43
                      1. binary search
                      2. math
                      30Substring with Concatenation of All Words31
                      1. string
                      1. two pointers
                      31Next Permutation52
                      1. array
                      1. permutation
                      32Longest Valid Parentheses41
                      1. string
                      1. dp
                      33Search in Rotated Sorted Array43
                      1. array
                      1. binary search
                      34Search for a Range43
                      1. array
                      1. binary search
                      35Search Insert Position22
                      1. array
                        36Valid Sudoku22
                        1. array
                          37Sudoku Solver42
                          1. array
                          1. dfs
                          38Count and Say21
                              39Combination Sum33
                              1. array
                              1. combination
                              40Combination Sum II42
                              1. array
                              1. combination
                              41First Missing Positive52
                              1. array
                              1. sort
                              42Trapping Rain Water42
                              1. array
                              1. two pointers
                              2. stack
                              43Multiply Strings43
                              1. string
                              1. two pointers
                              2. math
                              44Wildcard Matching53
                              1. string
                              1. recursion
                              2. dp
                              3. greedy
                              45Jump Game II42
                              1. array
                                46Permutations34
                                1. array
                                1. permutation
                                47Permutations II42
                                1. array
                                1. permutation
                                48Rotate Image42
                                1. array
                                  49Anagrams34
                                  1. string
                                  2. hashtable
                                    50Pow(x, n)35
                                      1. binary search
                                      2. math
                                      51N-Queens43
                                      1. array
                                      1. dfs
                                      52N-Queens II43
                                      1. array
                                      1. dfs
                                      53Maximum Subarray33
                                      1. array
                                      1. dp
                                      54Spiral Matrix42
                                      1. array
                                        55Jump Game32
                                        1. array
                                          56Merge Intervals45
                                          1. array
                                          2. linked list
                                          3. red-black tree
                                          1. sort
                                          2. merge
                                          57Insert Interval45
                                          1. array
                                          2. linked list
                                          3. red-black tree
                                          1. sort
                                          2. merge
                                          58Length of Last Word11
                                          1. string
                                            59Spiral Matrix II32
                                            1. array
                                              60Permutation Sequence51
                                                1. permutation
                                                2. math
                                                61Rotate List32
                                                1. linked list
                                                1. two pointers
                                                62Unique Paths23
                                                1. array
                                                1. dp
                                                63Unique Paths II33
                                                1. array
                                                1. dp
                                                64Minimum Path Sum33
                                                1. array
                                                1. dp
                                                65Valid Number25
                                                1. string
                                                1. math
                                                66Plus One12
                                                1. array
                                                1. math
                                                67Add Binary24
                                                1. string
                                                1. two pointers
                                                2. math
                                                68Text Justification42
                                                1. string
                                                  69Sqrt(x)44
                                                    1. binary search
                                                    70Climbing Stairs25
                                                      1. dp
                                                      71Simplify Path31
                                                      1. string
                                                      1. stack
                                                      72Edit Distance43
                                                      1. string
                                                      1. dp
                                                      73Set Matrix Zeroes35
                                                      1. array
                                                        74Search a 2D Matrix33
                                                        1. array
                                                        1. binary search
                                                        75Sort Colors42
                                                        1. array
                                                        1. sort
                                                        2. two pointers
                                                        76Minimum Window Substring42
                                                        1. string
                                                        1. two pointers
                                                        77Combinations34
                                                          1. combination
                                                          78Subsets34
                                                          1. array
                                                          1. recursion
                                                          2. combination
                                                          79Word Search34
                                                          1. array
                                                          1. dfs
                                                          80Remove Duplicates from Sorted Array II22
                                                          1. array
                                                          1. two pointers
                                                          81Search in Rotated Sorted Array II53
                                                          1. array
                                                          1. binary search
                                                          82Remove Duplicates from Sorted List II33
                                                          1. linked list
                                                          1. recursion
                                                          2. two pointers
                                                          83Remove Duplicates from Sorted List13
                                                          1. linked list
                                                            84Largest Rectangle in Histogram52
                                                            1. array
                                                            1. stack
                                                            85Maximal Rectangle51
                                                            1. array
                                                            1. dp
                                                            2. stack
                                                            86Partition List33
                                                            1. linked list
                                                            1. two pointers
                                                            87Scramble String52
                                                            1. string
                                                            1. recursion
                                                            2. dp
                                                            88Merge Sorted Array25
                                                            1. array
                                                            1. two pointers
                                                            2. merge
                                                            89Gray Code42
                                                              1. combination
                                                              90Subsets II42
                                                              1. array
                                                              1. recursion
                                                              2. combination
                                                              91Decode Ways34
                                                              1. string
                                                              1. recursion
                                                              2. dp
                                                              92Reverse Linked List II32
                                                              1. linked list
                                                              1. two pointers
                                                              93Restore IP Addresses33
                                                              1. string
                                                              1. dfs
                                                              94Binary Tree Inorder Traversal43
                                                              1. tree
                                                              2. hashtable
                                                              1. recursion
                                                              2. morris
                                                              3. stack
                                                              95Unique Binary Search Trees II41
                                                              1. tree
                                                              1. dp
                                                              2. dfs
                                                              96Unique Binary Search Trees31
                                                              1. tree
                                                              1. dp
                                                              97Interleaving String52
                                                              1. string
                                                              1. recursion
                                                              2. dp
                                                              98Validate Binary Search Tree35
                                                              1. tree
                                                              1. dfs
                                                              99Recover Binary Search Tree42
                                                              1. tree
                                                              1. dfs
                                                              100Same Tree11
                                                              1. tree
                                                              1. dfs
                                                              101Symmetric Tree12
                                                              1. tree
                                                              1. dfs
                                                              102Binary Tree Level Order Traversal34
                                                              1. tree
                                                              1. bfs
                                                              103Binary Tree Zigzag Level Order Traversal43
                                                              1. queue
                                                              2. tree
                                                              1. bfs
                                                              2. stack
                                                              104Maximum Depth of Binary Tree11
                                                              1. tree
                                                              1. dfs
                                                              105Construct Binary Tree from Preorder and Inorder Tr33
                                                              1. array
                                                              2. tree
                                                              1. dfs
                                                              106Construct Binary Tree from Inorder and Postorder T33
                                                              1. array
                                                              2. tree
                                                              1. dfs
                                                              107Binary Tree Level Order Traversal II31
                                                              1. tree
                                                              1. bfs
                                                              108Convert Sorted Array to Binary Search Tree23
                                                              1. tree
                                                              1. dfs
                                                              109Convert Sorted List to Binary Search Tree43
                                                              1. linked list
                                                              1. recursion
                                                              2. two pointers
                                                              110Balanced Binary Tree12
                                                              1. tree
                                                              1. dfs
                                                              111Minimum Depth of Binary Tree11
                                                              1. tree
                                                              1. dfs
                                                              112Path Sum13
                                                              1. tree
                                                              1. dfs
                                                              113Path Sum II21
                                                              1. tree
                                                              1. dfs
                                                              114Flatten Binary Tree to Linked List33
                                                              1. tree
                                                              1. recursion
                                                              2. stack
                                                              115Distinct Subsequences42
                                                              1. string
                                                              1. dp
                                                              116Populating Next Right Pointers in Each Node33
                                                              1. tree
                                                              1. dfs
                                                              117Populating Next Right Pointers in Each Node II42
                                                              1. tree
                                                              1. dfs
                                                              118Pascal's Triangle21
                                                              1. array
                                                                119Pascal's Triangle II21
                                                                1. array
                                                                  120Triangle31
                                                                  1. array
                                                                  1. dp
                                                                  121Best Time to Buy and Sell Stock21
                                                                  1. array
                                                                  1. dp
                                                                  122Best Time to Buy and Sell Stock II31
                                                                  1. array
                                                                  1. greedy
                                                                  123Best Time to Buy and Sell Stock III41
                                                                  1. array
                                                                  1. dp
                                                                  124Binary Tree Maximum Path Sum42
                                                                  1. tree
                                                                  1. dfs
                                                                  125Valid Palindrome25
                                                                  1. string
                                                                  1. two pointers
                                                                  126Word Ladder II11
                                                                      127Word Ladder35
                                                                      1. graph
                                                                      1. bfs
                                                                      2. shortest path
                                                                      128Longest Consecutive Sequence43
                                                                      1. array
                                                                        129Sum Root to Leaf Numbers24
                                                                        1. tree
                                                                        1. dfs

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