尝试n = 50000的测试数据,用时0.1s。 看来在STL set里用lower_bound效率是n^2的。 [Aug 24, 2014 Update] 我意外地发现set里也有一个lower_bound函数,于是去试了一下。效率很高耶。 ///main.cpp//test///Created by Africamonkey on 8/24/14.//Copyright (c) 2014 Africamonkey. All rights reserved...
而set自带的lower_bound函数无法传入一个自定义的比较函数,只能基于元素默认的比较方法(对于pair<int,int>默认优先考虑first的大小,first大小相同时才比较second的大小)。于是我就想,泛型函数lower_bound可以传入一个函数指针实现自定义比较函数(和往sort里传一个函数指针一样),那么我用泛型函数去进行二分查找不就好了...
lower bound 英[ˈləuə baund] 美[ˈlaʊɚ baʊnd] 释义 下界,下限 实用场景例句 全部 An almostlower boundis defined similarly as an almost upper bound. 殆下界的定义与殆上界是类似的. 辞典例句 The greatestlower boundof A is also called the infimum of A....
It is shown that the new bounds include the known Lempel-Greenberger bound, Peng-Fan bounds, Eun-Jin-Hong-Song bound and Peng-Fan-Lee bounds as special cases. 展开 关键词: frequency hopping sequences correlation window low hit zone maximum partial hamming correlation ...
On the Power of Cascade Ciphers Next, it is shown that two stages are not worse than one, by a simple reduction of the cracking problem of any of the stages to the cracking problem of the cascade. Finally, it is shown that proving a nonpolynomial lower bound... S Even,O Goldreich -...
set和lower_bound()也是一样。有一个统一的函数std::lower_bound(),它在随机访问迭代器上的O(logN)中工作,在其他迭代器上的O(N)中工作。容器std::set具有双向迭代器,不能提供对其成员的随机访问。所以统一的std::lower_bound()在O(N)中工作。而容器集是二叉搜索树,可以使用不同的算法在O(logN)中找到下界...
template<class _K, class _Pr, class _A> class set { public: // Function 1: const_iterator lower_bound(const _K& _Kv) const; // Function 2: const_iterator upper_bound(const _K& _Kv) const; // Function 3: _Paircc equal_range(const _K& _Kv) const; } Notes...
set使用实例1+lower_bound(val): 代码语言:javascript 复制 1 #include<stdio.h> 2 #include<set> 3 #include<iostream> 4 #include<algorithm> 5 #include<string.h> 6 #include 7 using namespace std; 8 int main() 9 { 10 int n; 11 while(~scanf("%d",&n)) 12 { 13 map<int ,int>lson...
S. Abdel-Ghaffar derives a lower bound on the probability of undetected error for unrestricted codes. The proof relies implicitly on the binom... A.,BargA.,Ashikhmin - 《Designs Codes & Cryptography》 被引量: 25发表: 1999年 Binary constant-weight codes for error detection. Studies the ...
We study the form of a vector MDS code having the property that we can repair failed nodes belonging to a fixed set of Q Q nodes with minimum repair bandwidth and in optimal-access fashion, and which achieve our lower bound on sub-packetization level \alpha \alpha . It turns out ...