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.vscode
.vscode
 
 
133.clone.graph
133.clone.graph
 
 
148.sort.list
148.sort.list
 
 
169.majority.element
169.majority.element
 
 
207.course.schedule
207.course.schedule
 
 
210.couser.scheduler.2
210.couser.scheduler.2
 
 
215.kth.largest
215.kth.largest
 
 
216.Combination.Sum.3
216.Combination.Sum.3
 
 
22.generate.parentheses
22.generate.parentheses
 
 
240.search.2d.matrix.2
240.search.2d.matrix.2
 
 
241.diff.ways.add.parentheses
241.diff.ways.add.parentheses
 
 
242.valid.anagram
242.valid.anagram
 
 
264.ugly.num.2
264.ugly.num.2
 
 
269.alien.dict
269.alien.dict
 
 
274.h-index
274.h-index
 
 
310.min.height.trees
310.min.height.trees
 
 
312.burst.balloons
312.burst.balloons
 
 
313.super.ugly.num
313.super.ugly.num
 
 
329.longest.increasing.path.in.matrix
329.longest.increasing.path.in.matrix
 
 
332.reconstruct.itinerary
332.reconstruct.itinerary
 
 
347.top.k.frequent.elements
347.top.k.frequent.elements
 
 
349.intersection.of.2.arrays
349.intersection.of.2.arrays
 
 
350.intersection.of.2.arrays.2
350.intersection.of.2.arrays.2
 
 
355.design.twitter
355.design.twitter
 
 
373.find.k.pairs.with.smallest.sums
373.find.k.pairs.with.smallest.sums
 
 
378.kth.smallest.element.in.a.sorted.matrix
378.kth.smallest.element.in.a.sorted.matrix
 
 
378.kth.smallest.elements.in.sorted.matrix
378.kth.smallest.elements.in.sorted.matrix
 
 
39.Combination.Sum
39.Combination.Sum
 
 
399.evaluate.division
399.evaluate.division
 
 
399.evaluation.division
399.evaluation.division
 
 
3Sum Closest
3Sum Closest
 
 
3Sum
3Sum
 
 
40.Combination.Sum.2
40.Combination.Sum.2
 
 
401.binary.watch
401.binary.watch
 
 
444.sequence.reconstruction
444.sequence.reconstruction
 
 
451.sort.character.by.freq
451.sort.character.by.freq
 
 
46.Permutations
46.Permutations
 
 
47.Permutations.2
47.Permutations.2
 
 
479.largest.palindrome.product
479.largest.palindrome.product
 
 
480.sliding.window.median
480.sliding.window.median
 
 
4sum
4sum
 
 
526.beautiful.arrangement
526.beautiful.arrangement
 
 
53.Maximum.Subarray
53.Maximum.Subarray
 
 
560.subarray.sum.equals.k
560.subarray.sum.equals.k
 
 
60.Permutation.Sequence
60.Permutation.Sequence
 
 
630.course.schedule.3
630.course.schedule.3
 
 
656.coin.path
656.coin.path
 
 
659.split.array.into.consecutive.subseq
659.split.array.into.consecutive.subseq
 
 
77.comibnations
77.comibnations
 
 
78.Subsets
78.Subsets
 
 
90.Subsets.2
90.Subsets.2
 
 
93.restore.ip
93.restore.ip
 
 
Container With Most Water
Container With Most Water
 
 
Gas Station
Gas Station
 
 
House Robber 2
House Robber 2
 
 
House Robber
House Robber
 
 
Integer Break
Integer Break
 
 
Is Subsequence
Is Subsequence
 
 
Longest Palindromic Substring
Longest Palindromic Substring
 
 
Longest Substring Without Repeating Characters
Longest Substring Without Repeating Characters
 
 
Maximum Product of Word Lengths
Maximum Product of Word Lengths
 
 
Median of Two Sorted Arrays
Median of Two Sorted Arrays
 
 
Non-overlapping Intervals
Non-overlapping Intervals
 
 
Populating Next Right Pointers in Each Node
Populating Next Right Pointers in Each Node
 
 
Q reconstruction by height
Q reconstruction by height
 
 
Range Sum Query-Immutable
Range Sum Query-Immutable
 
 
RemoveDuplicatesFromSortedArray
RemoveDuplicatesFromSortedArray
 
 
Reshape Matrix
Reshape Matrix
 
 
Reverse Integer
Reverse Integer
 
 
Shortest Unsorted Continuous Subarray
Shortest Unsorted Continuous Subarray
 
 
Substring with Concatenation of All Words
Substring with Concatenation of All Words
 
 
Wiggle Subsequence
Wiggle Subsequence
 
 
add 2 numbers
add 2 numbers
 
 
add_two_numbers
add_two_numbers
 
 
assign cookies
assign cookies
 
 
best time to buy and sell stock 2
best time to buy and sell stock 2
 
 
best time to buy and sell stock
best time to buy and sell stock
 
 
climbStairs
climbStairs
 
 
decodeString
decodeString
 
 
editDistance
editDistance
 
 
find_disappear_numbers
find_disappear_numbers
 
 
fizzbuzz
fizzbuzz
 
 
generate.multi.parentheses
generate.multi.parentheses
 
 
generateTrees
generateTrees
 
 
generateTrees2
generateTrees2
 
 
group anagrams
group anagrams
 
 
hamming_distance
hamming_distance
 
 
jump_game
jump_game
 
 
jump_game2
jump_game2
 
 
largest divisible subset
largest divisible subset
 
 
max product subarray
max product subarray
 
 
max subarray
max subarray
 
 
maxmal rectangle
maxmal rectangle
 
 
merge_intervals
merge_intervals
 
 
min num of arrows to burst ballons
min num of arrows to burst ballons
 
 
minPathSum
minPathSum
 
 
permutation
permutation
 
 
python built-in func
python built-in func
 
 
regex matching
regex matching
 
 
remove k digits
remove k digits
 
 

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leetcode

  • 22.Generate Parentheses

    • 尽管yield/next会省内存, 但遍历所有可能永远比只计算有限的可能要慢的多的多
    • 解决根本矛盾的好方法比边角细节的技巧要影响大的多
    • 出错尽快放弃比列举所有可能再逐一排查要快
    • 所有以上结论均建立在时间单向均匀流逝的基础上

    $$\int_{-\infty}^\infty e^{-x^2} = \sqrt{\pi}$$

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