参考priority_queue的文档后,我们可以借用std::function来实现一个更加通用可读性更好的的comparator。 #include <iostream> #include <queue> #include <functional> using namespace std; // 将priority_queue的第三个参数穿进去一个function对象。 typedef
using PII =pair<int,int>;autocmp = [&](constPII& a,constPII& b) {intsum1 = nums1[a.first] + nums2[a.second];intsum2 = nums1[b.first] + nums2[b.second];return(sum1 > sum2) || ((sum1 == sum2) && (a.first < b.first)); };// vitalpriority_queue<PII,deque<PII>...
Where,vector<int>works as container and greater<int> as comparator class, Define your own comparator for priority queue You may have often come to a situation when you need to use a priority queue, but your datatype is something else that can't be compared by default (using '<' operator...
I am having problem writing a custom comparator for priority queue in C++. The elements' type in the queue ispair<long long,pair<long long, long long>>I want the queue to rank the elements with the smallestfirstelement first, and if there is a tie, rank the elements with the smallests...
__cpp_lib_constexpr_queue202502L(C++26)constexprstd::priority_queue Example Run this code #include <functional>#include <iostream>#include <queue>#include <string_view>#include <vector>template<typenameT>voidpop_println(std::string_viewrem, T&pq){std::cout<<rem<<": ";for(;!pq.empty(...
priority_queue(std::from_range_t, R&&rg,constAlloc&alloc); (22)(since C++23) Constructs new underlying container of the container adaptor from a variety of data sources. 1)Default constructor. Value-initializes the comparator and the underlying container. ...
要自定义 priority_queue 的排序规则,你需要提供一个比较函数或仿函数。以下是几种自定义比较函数的方法: 3.1 使用仿函数(函数对象) 定义一个结构体或类,重载 operator() 来实现比较逻辑: cpp #include <iostream> #include <queue> #include <vector> struct CustomComparator { bool opera...
1#include <iostream>2#include <string>3#include <vector>4#include <queue>5usingnamespacestd;678structprocessor9{10intpriority;11stringname;12processor(int_priority,string_name): priority(_priority), name(_name){};13processor()14{15priority =0;16name ="-";17}18};1920structcomparator21{22bo...
auto cmp = [](const std::pair<int, int>& a, const std::pair<int, int>& b) { return a.second < b.second; // 使得优先队列按照 pair 的第二个元素降序排列 }; std::priority_queue<std::pair<int, int>, std::vector<std::pair<int, int>>, decltype(cmp)> pq(cmp); 问...
Java PriorityQueue is an unbounded Queue implementation that processes the items based on priorities. Custom ordering can be enforced with a Comparator.