logo
down
shadow

What is the correct way of implementing this custom priority_queue


What is the correct way of implementing this custom priority_queue

By : user3100706
Date : January 12 2021, 09:11 PM
should help you out Comparison routines must return false if the two elements are equal, but your version returns true.
Try this instead
code :
bool compare(triplet x, triplet y) {

    if (x.data < y.data) {
        return true;
    }
    else {
        return false;
    }
}
bool compare(triplet x, triplet y) {    
    return x.data < y.data;
}
priority_queue<triplet, vector<triplet>, bool (*)(triplet, triplet)> pq1(compare);


Share : facebook icon twitter icon
iFrame Like Button on Facebook custom onClick, the correct way of implementing?

iFrame Like Button on Facebook custom onClick, the correct way of implementing?


By : Mishka Beekeeper
Date : March 29 2020, 07:55 AM
help you fix your problem
then is there a way to remove the "share" box after clicking an XFBML button?
code :
.fb_edge_widget_with_comment span.fb_edge_comment_widget { display: none !important; }
c++ stl correct parameters to priority_queue

c++ stl correct parameters to priority_queue


By : Weraphol Sukthai
Date : March 29 2020, 07:55 AM
it fixes the issue Below is the code snippet which is incorrect.
code :
#include <queue>
#include <iostream>

class edge{
public:
    int src;
    int dest;
    int wt;
};

struct less_weight {
    bool operator() (const edge& a, const edge& b) {
        return a.wt < b.wt;
    }
};

struct greater_weight {
    bool operator() (const edge& a, const edge& b) {
        return a.wt > b.wt;
    }
};

int main()
{
    std::priority_queue<int,std::vector<edge>,less_weight> prioritise_higher_weights;
    prioritise_higher_weights.push(edge{0, 1, 1 });
    prioritise_higher_weights.push(edge{1, 2, 2 });
    prioritise_higher_weights.push(edge{2, 3, 3 });

    std::priority_queue<int,std::vector<edge>,greater_weight> prioritise_lower_weights;
    prioritise_lower_weights.push(edge{0, 1, 1 });
    prioritise_lower_weights.push(edge{1, 2, 2 });
    prioritise_lower_weights.push(edge{2, 3, 3 });

    std::cout << prioritise_higher_weights.top().wt << std::endl;
    std::cout << prioritise_lower_weights.top().wt << std::endl;
}
3
1
How should I correct this priority_queue comparison function?

How should I correct this priority_queue comparison function?


By : user3000833
Date : March 29 2020, 07:55 AM
I wish this help you Why you there is a priority_queue? Looks like we missing some information.
There are couple ways to fix issue with counts and lambda:
code :
vector<int> sortedByFreq(const vector<int>& nums)
{
    unordered_map<int, int> counts;
    for (auto i : nums)
        ++counts[i];

    vector<int> result = nums;
    std::sort(result.begin(), result.end(),
              [counts](auto a, auto b) {
                  return counts.at(a) > counts.at(b);
              });

    return result;
}
error: could not convert ‘minHeap’ from ‘std::priority_queue, std::greater >’ to ‘std::priority_queue

error: could not convert ‘minHeap’ from ‘std::priority_queue, std::greater >’ to ‘std::priority_queue


By : MGupta
Date : March 29 2020, 07:55 AM
wish helps you Your are trying to pass variable with priority_queue, greater > type, but your function expects priority_queue type.
Correct the prototype of function:
"error: no matching function for call to 'std::priority_queue<int>::priority_queue(int)' priority_queue<in

"error: no matching function for call to 'std::priority_queue<int>::priority_queue(int)' priority_queue<in


By : pg1024
Date : October 02 2020, 10:00 AM
hope this fix your issue related question
std::priority_queue doesn't have such constructor, but the below code implements what you want:
code :
std::vector<int> temporary_container(4);

std::priority_queue<int, std::vector<int>> pqueue (comparator, std::move(container));
std::vector<int> temporary_container;
temporary_container.reserve(4);

std::priority_queue<int, std::vector<int>> pqueue (comparator, std::move(container));
Related Posts Related Posts :
  • Two template classes use each other as template argument
  • Why am I not getting any output, for my code on insertion in linked list?
  • Unable to set the location for input in vertex shader
  • Qt: How to Access Inherited Widget?
  • Why same char is not equal
  • Why does using a range for loop gives different output than using a regular for loop in this scenario?
  • Binary tree coding problems with c++?
  • How to safely change the type of a pointer
  • Could this publish / check-for-update class for a single writer + reader use memory_order_relaxed or acquire/release for
  • Passing a function identifier as an rvalue reference and applying std::move() to it
  • The conditional operator is not allowing the program to terminate
  • Define a c++ string as "\"
  • memcpy on __declspec naked returns unexpected bytes
  • What is the proper way to link enums with CMake?
  • is it safe to use the same mutex with lock_gard and without it in other parts of code
  • How to decode MAP Invoke messages using asn1c generated code
  • How do you write multiple lines in a .txt with recursion?
  • Member function with strange type causing callback function mismatch
  • Visual Studio optimisations break SDL graphical output
  • How to use less memory in Sieve_of_Eratosthenes
  • Covariance in Callback Parameters C++
  • switch may fall through (no it may not)
  • Compilation fails calling Cocoa function from C++
  • How to handle classes with differently named member functions in algorithms?
  • Convert QString to QJsonArray
  • Data exchange finished in CPropertyPage::OnOK?
  • Template member specialization in template class
  • Is it not possible to assign a struct to an index of a vector?
  • Why is empty unordered_map.find not returning end()?
  • Template argument deduction for inheriting specializations
  • dlopen undefined reference
  • Member function of class with template arguments and default arguments outside class
  • Is it possible to implement a non-owning "slightly smart" pointer on top of standard weak pointers?
  • how to configure the AcquireCredentialsHandleA correctly
  • Using private versions of global extern variables with OpenMP
  • Eigen Block wrong amount of columns and rows
  • Memory alignment rules in inheritance
  • Is nullptr falsy?
  • tm_wday returns a large integer outside 0-6 range
  • Scope a using declaration, inside a header
  • How to specify constructor's template arguments inside a new expression?
  • Avoid allocating in constructor or preserve simplicity (and RAII?)
  • Can C++ raise an error when std array initialization is too small?
  • Reference to end is ambiguous
  • Problem with basic usage of std::enable_if
  • How to print out a decimal number as octal number using setiosflags in C++
  • Open Visual Studio with solution and specific file and line
  • Enum value based on template type
  • Is there any way to swap nodes in std::list?
  • How to copy QString into wchar_t buffer
  • Make the compiler generate an empty default function for an std::function
  • Insert or push_back to end of a std::vector?
  • Best practice for const temporary types
  • Include CSV File in Complied Binary
  • Issue with binding non static function to callback
  • How can read from some files and write content of them with different form into files with same names
  • Why does auto deduce this variable as double and not float?
  • no instance of overloaded function "std::make_unique" matches the argument list, but works with unique_ptr con
  • How to see array size from a pointer in c++
  • Error taking address of temporary in Eclipse
  • shadow
    Privacy Policy - Terms - Contact Us © festivalmusicasacra.org