LeetCode参考Java版本

Leetcode

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LEETCODE'FIRST'400'Q&A'

simple!solutions!

1.01!

FELOMENG!

Contents'

1.! Two!Sum!.........................................................................................................................................................!1!

2.! Add!Two!Numbers!..........................................................................................................................................!1!

3.! Longest!Substring!Without!Repeating!Characters!.........................................................................................!1!

4.! Median!of!Two!Sorted!Arrays!.........................................................................................................................!2!

5.! Longest!Palindromic!Substring!.......................................................................................................................!2!

6.! ZigZag!Conversion!..........................................................................................................................................!3!

7.! Reverse!Integer!..............................................................................................................................................!3!

8.! String!to!Integer!(atoi)!....................................................................................................................................!3!

9.! Palindrome!Number!.......................................................................................................................................!4!

10.! Regular!Expression!Matching!.....................................................................................................................!4!

11.! Container!With!Most!Water!.......................................................................................................................!5!

12.! Integer!t o !R o m a n !.......................................................................................................................................!5!

13.! Roman!to!Integer! ................................ .......................................................................................................!5!

14.! Longest!Common!Prefix!.............................................................................................................................!6!

15.! 3Sum!...........................................................................................................................................................!6!

16.! 3Sum!Closest!..............................................................................................................................................!6!

17.! Letter!Combinations!of!a!Phone!Number!...................................................................................................!7!

18.! 4Sum!...........................................................................................................................................................!7!

19.! Remove!Nth!Node!From!End!of!List!...........................................................................................................!8!

20.! Valid!Parentheses!.......................................................................................................................................!9!

21.! Merge!Two!Sorted!Lists!..............................................................................................................................!9!

22.! Generate!Parentheses!................................................................................................................................!9!

23.! Merge!k!Sorted!Lists!.................................................................................................................................!10!

24.! Swap!Nodes!in!Pairs!.................................................................................................................................!10!

25.! Reverse!Nodes!in!k-Group!........................................................................................................................!10!

26.! Remove!Duplicates!from!Sorted!Array!.....................................................................................................!11!

27.! Remove!Element!......................................................................................................................................!11!

28.! Implement!strStr()!....................................................................................................................................!11!

29.! Divide!Two!Integers!..................................................................................................................................!12!

30.! Substring!with!Concatenation!of!All!Words!.............................................................................................!12!

31.! Next!Permutation!.....................................................................................................................................!13!

32.! Longest!Valid!Parentheses!.......................................................................................................................!13!

33.! Search!in!Rotated!Sorted!Array!................................................................................................................!13!

34.! Search!for!a!Range!....................................................................................................................................!14!

35.! Search!Insert!Position!...............................................................................................................................!14!

ii!

36.! Valid!Sudoku!.............................................................................................................................................!15!

37.! Sudoku!Solver!...........................................................................................................................................!15!

38.! Count!and!Say!...........................................................................................................................................!16!

39.! Combination!Sum!.....................................................................................................................................!16!

40.! Combination !S um!II!..................................................................................................................................!17!

41.! First!Missing!Positive!................................................................................................................................!17!

42.! Trapping!Rain!Water!................................................................................................................................!18!

43.! Multiply!Strings!........................................................................................................................................!18!

44.! Wildcard!Matching!...................................................................................................................................!19!

45.! Jump!Ga m e!II!............................................................................................................................................!20!

46.! Permutations!............................................................................................................................................!20!

47.! Permutations!II!.........................................................................................................................................!20!

48.! Rotate!Image!............................................................................................................................................!21!

49.! Group!Anagrams!......................................................................................................................................!21!

50.! Pow(x,!n)!...................................................................................................................................................!21!

51.! N-Queens!..................................................................................................................................................!22!

52.! N-Queens!II!...............................................................................................................................................!23!

53.! Maximum!Subarray!..................................................................................................................................!23!

54.! Spiral!Matrix!.............................................................................................................................................!24!

55.! Jump!Ga m e!...............................................................................................................................................!24!

56.! Merge!Intervals!........................................................................................................................................!25!

57.! Insert!Int e rva l!...........................................................................................................................................!25!

58.! Length!of!Last!Word!.................................................................................................................................!25!

59.! Spiral!Matrix!II!..........................................................................................................................................!26!

60.! Permutation!Sequence!.............................................................................................................................!26!

61.! Rotate!List!.................................................................................................................................................!27!

62.! Unique!Paths!............................................................................................................................................!27!

63.! Unique!Paths!II!.........................................................................................................................................!27!

64.! Minimum!Path!Sum!..................................................................................................................................!28!

65.! Valid!Number!...........................................................................................................................................!28!

66.! Plus!One!...................................................................................................................................................!29!

67.! Add!Binary!................................................................................................................................................!29!

68.! Text!Justification!.......................................................................................................................................!29!

69.! Sqrt(x)!.......................................................................................................................................................!30!

70.! Climbing!Stairs!..........................................................................................................................................!30!

71.! Simplify!Path!.............................................................................................................................................!31!

72.! Edit!Distance!.............................................................................................................................................!31!

iii!

73.! Set!Matrix!Zeroes!................................................................ .....................................................................!31!

74.! Search!a!2D!Matrix!...................................................................................................................................!32!

75.! Sort!Colors!................................................................................................................................................!32!

76.! Minimum!Window!Substring!....................................................................................................................!33!

77.! Combinations!...........................................................................................................................................!33!

78.! Subsets!.....................................................................................................................................................!34!

79.! Word!Search!.............................................................................................................................................!34!

80.! Remove!Duplicates!from!Sorted!Array!II!................................ ..................................................................!35!

81.! Search!in!Rotated!Sorted!Array!II!.............................................................................................................!35!

82.! Remove!Duplicates!from!Sorted!List!II!.....................................................................................................!35!

83.! Remove!Duplicates!from!Sorted!List!........................................................................................................!36!

84.! Largest!Rectangle!in!Histogram!................................................................................................................!36!

85.! Maximal!Rectangle!...................................................................................................................................!37!

86.! Partition!List!.............................................................................................................................................!38!

87.! Scramble!String!........................................................................................................................................!38!

88.! Merge!Sorted!Array!..................................................................................................................................!39!

89.! Gray!Code!.................................................................................................................................................!39!

90.! Subsets!II!..................................................................................................................................................!39!

91.! Decode!Ways!............................................................................................................................................!40!

92.! Reverse!Linked!List!II!................................................................................................................................!40!

93.! Restore!IP!Addresses!................................................................................................................................!40!

94.! Binary!Tree!Inorder!Traversal!...................................................................................................................!41!

95.! Unique!Binary!Search!Trees!II!...................................................................................................................!41!

96.! Unique!Binary!Search!Trees!.....................................................................................................................!42!

97.! Interleav in g !St rin g!....................................................................................................................................!42!

98.! Validate!Binary!Search!Tree!.....................................................................................................................!42!

99.! Recover!Binary!Search!Tree!......................................................................................................................!43!

100.! Same!Tree!.................................................................................................................................................!43!

101.! Symmetric!Tree!........................................................................................................................................!44!

102.! Binary!Tree!Level!Order!Traversal!............................................................................................................!45!

103.! Binary!Tree!Zigzag!Level!Order!Traversal!.................................................................................................!45!

104.! Maximum!Depth!of!Binary!Tree!...............................................................................................................!46!

105.! Construct!Binary!Tree!from!Preorder!and!Inorder!Traversal!...................................................................!46!

106.! Construct!Binary!Tree!from!Inorder!and!Postorder!Traversal!..................................................................!46!

107.! Binary!Tree!Level!Order!Traversal!II!.........................................................................................................!47!

108.! Convert!Sorted!Array!to!Binary!Search!Tree!............................................................................................!47!

109.! Convert!Sorted!List!to!Binary!Search!Tree!................................................................................................!47!

iv!

110.! Balanced!Binary!Tree!................................................................................................................................!48!

111.! Minimum!Depth!of!Binary!Tree!................................................................................................................!48!

112.! Path!Sum!..................................................................................................................................................!48!

113.! Path!Sum!II!...............................................................................................................................................!49!

114.! Flatten!Binary!Tree!to!Linked!List!.............................................................................................................!49!

115.! Distinct!Subsequences!..............................................................................................................................!50!

116.! Populating!Next!Right!Pointers!in!Each!Node!..........................................................................................!50!

117.! Populating!Next!Right!Pointers!in!Each!Node!II!........................................................................................!51!

118.! Pascal's!Triangle!.......................................................................................................................................!51!

119.! Pascal's!Triangle!II!....................................................................................................................................!52!

120.! Triangle!.....................................................................................................................................................!52!

121.! Best!Time!to!Buy!and!Sell!Stock!...............................................................................................................!52!

122.! Best!Time!to!Buy!and!Sell!Stock!II!.............................................................................................................!53!

123.! Best!Time!to!Buy!and!Sell!Stock!III!............................................................................................................!53!

124.! Binary!Tree!Maximum!Path!Sum!..............................................................................................................!53!

125.! Valid!Palindrome!......................................................................................................................................!53!

126.! Word!Ladder!II!..........................................................................................................................................!54!

127.! Word!Ladder!.............................................................................................................................................!55!

128.! Longest!Consecutive!Sequence!................................ ................................................................................!56!

129.! Sum!Root!to!Leaf!Numbers!......................................................................................................................!56!

130.! Surrounded!Regions!.................................................................................................................................!57!

131.! Palindrome!Partitioning!...........................................................................................................................!57!

132.! Palindrome!Partitioning!II!........................................................................................................................!58!

133.! Clone!Graph!..............................................................................................................................................!59!

134.! Gas!Station!...............................................................................................................................................!59!

135.! Candy!........................................................................................................................................................!59!

136.! Single!Number!..........................................................................................................................................!60!

137.! Single!Number!II!................................................................................................ .......................................!60!

138.! Copy!List!with!Random!Pointer!................................................................................................................!60!

139.! Word!Break!..............................................................................................................................................!60!

140.! Word!Break!II!............................................................................................................................................!61!

141.! Linked!List!Cycle!.......................................................................................................................................!61!

142.! Linked!List!Cycle!II!.....................................................................................................................................!61!

143.! Reorder!List!..............................................................................................................................................!62!

144.! Binary!Tree!Preorder!Traversal!................................................................................................................!62!

145.! Binary!Tree!Postorder!Traversal!...............................................................................................................!63!

146.! LRU!Cache!................................ .................................................................................................................!63!

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