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数据结构、算法复杂度一览表 - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
...O(|V|)
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n元已排数组
O(log(n))
O(log(n))
O(1)
线性搜索(暴力法)
数组
O(n)
O(n)
O(1)
Dijkstra最短路径算法(最小堆作为优先队列)
图G(V,E), V为顶点集, E为边集
O((|V| + |E|) log |V|)
O((|V| + |E|) log |V|)
O(|V|...
Why does [5,6,8,7][1,2] = 8 in JavaScript?
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[1,2,3,4,5,6][1,2,3];
^ ^
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array + — array subscript access operation,
where index is `1,2,3`,
which is an expression that evaluates to `3`.
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Grouping functions (tapply, by, aggregate) and the *apply family
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10 Answers
10
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Why doesn't Python have a sign function?
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12 Answers
12
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How to use if - else structure in a batch file?
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112
Your syntax is incorrect. You can't use ELSE IF. It appears that you don't really need it anyw...
Center a map in d3 given a geoJSON object
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11 Answers
11
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Are list-comprehensions and functional functions faster than “for loops”?
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154
The following are rough guidelines and educated guesses based on experience. You should timeit...
Summarizing multiple columns with dplyr? [duplicate]
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#> <int> <dbl> <dbl> <dbl> <dbl>
#> 1 1 3.08 2.98 2.98 2.91
#> 2 2 3.03 3.04 2.97 2.87
#> 3 3 2.85 2.95 2.95 3.06
If you want to summarize only certain columns, use summarise_at or summarise_if functions.
Alternatively, the purrrl...
Are there any O(1/n) algorithms?
Are there any O(1/n) algorithms?
32 Answers
32
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