lower-bound

问题 Let's say I have the following classes Animal , Fish , and CatFish . CatFish extends Fish and Fish extends Animal . There is a generic class called MyPets , which has a type parameter (generic) called T , and that will be parameterized with the above classes' objects. My question is, how do I create a lower bounded method in D that will take any objects that is a PARENT class of the CatFish class. 回答1: You can't. TL;DR: Type parameters can have several bounds, like in class Box {...} . But a

问题 Let's say I have the following classes Animal , Fish , and CatFish . CatFish extends Fish and Fish extends Animal . There is a generic class called MyPets , which has a type parameter (generic) called T , and that will be parameterized with the above classes' objects. My question is, how do I create a lower bounded method in D that will take any objects that is a PARENT class of the CatFish class. 回答1: You can't. TL;DR: Type parameters can have several bounds, like in class Box {...} . But a

问题 Ok so this is not a homework question obviously, but here is the thing: The bubble sort algorithm is said to be O(n^2), Ω(n). However, if we plot its time complexity as a graph (average case), and try to lower bound it, a more accurate lower bound would be Ω(n^2). However contextually we see that Ω(n) is correct. So why does lower bounding the algorithm's runtime does not work? 回答1: I think you're mixing up concepts: Lower bound vs upper bound: Ω(f(n)) is a lower bound, and O(f(n)) is an

问题 Ok so this is not a homework question obviously, but here is the thing: The bubble sort algorithm is said to be O(n^2), Ω(n). However, if we plot its time complexity as a graph (average case), and try to lower bound it, a more accurate lower bound would be Ω(n^2). However contextually we see that Ω(n) is correct. So why does lower bounding the algorithm's runtime does not work? 回答1: I think you're mixing up concepts: Lower bound vs upper bound: Ω(f(n)) is a lower bound, and O(f(n)) is an

问题 What I am trying to accomplish is iterating through a vector of double values and returning the vector position of the closest possible double. I am having two issues with this. When attempting to find the closest double value in the vector using lower_bound() , i only receive a value other than zero if I enter 1. I am not sure how to use lower_bound to return a vector position instead of a double value. Here is my three main files I am using with attempted code Convert.cpp double Convert:

问题 Now I am completely confused. I am googling all day and still can't get why this code doesn't work. I have vector of structs and those structs have string property. When I want to add a new struct into vector , as first I have to check whether a struct with the same string property is already there. If it is, it won't be added. #include <iostream> #include <vector> #include <algorithm> using namespace std; struct Try{ string name; Try( string name) : name ( name ) { } bool operator < ( const

问题 Now I am completely confused. I am googling all day and still can't get why this code doesn't work. I have vector of structs and those structs have string property. When I want to add a new struct into vector , as first I have to check whether a struct with the same string property is already there. If it is, it won't be added. #include <iostream> #include <vector> #include <algorithm> using namespace std; struct Try{ string name; Try( string name) : name ( name ) { } bool operator < ( const

问题 The C++ draft says about std::lower_bound: § 25.4.3.1 lower_bound [lower.bound] template<class ForwardIterator, class T> ForwardIterator lower_bound(ForwardIterator first, ForwardIterator last, const T& value); template<class ForwardIterator, class T, class Compare> ForwardIterator lower_bound(ForwardIterator first, ForwardIterator last, const T& value, Compare comp); Requires: The elements e of [first,last) shall be partitioned with respect to the expression e < value or comp(e, value).

问题 I'm converting some C++ code to C# and it calls std::map::lower_bound(k) to find an entry in the map whose key is equal to or greater than k. However, I don't see any way to do the same thing with .NET's SortedDictionary. I suspect I could implement a workaround using SortedList, but unfortunately SortedList is too slow (O(n) for inserting and deleting keys). What can I do? Note: I found a workaround using that takes advantage of my particular scenario... Specifically, my keys are a dense

问题 I'm converting some C++ code to C# and it calls std::map::lower_bound(k) to find an entry in the map whose key is equal to or greater than k. However, I don't see any way to do the same thing with .NET's SortedDictionary. I suspect I could implement a workaround using SortedList, but unfortunately SortedList is too slow (O(n) for inserting and deleting keys). What can I do? Note: I found a workaround using that takes advantage of my particular scenario... Specifically, my keys are a dense