priority_queue<Type, Container, Funcitonal>; priority_queue<pair<int,int> > pq_pair;//结果先按照pair的first元素降序,first元素相等再按照second元素降序 priority_queue<pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> >
priority_queue<node,vector<node>,cmp>pq; for(inti = 1; i < n; i *= 2) { node no; no.x = i; no.y = 100 - i; pq.push(no); } while(!pq.empty()) { cout << pq.top().x << endl; pq.pop(); } flag++; } } 如上所示; 2.通过重载struct中的<单目运算符: 1 2 3 ...
priority_queue<node> pq; pq.push(node(1,2)); pq.push(node(2,2)); pq.push(node(2,3)); pq.push(node(3,3)); pq.push(node(3,4)); pq.push(node(4,4)); pq.push(node(4,5)); pq.push(node(5,5)); while(!pq.empty()) { cout<<().x<<().y<<endl; pq.pop(); } ...
priority_queue<int> pq1; priority_queue<int> pq2(num, num + 6); //默认情况大顶堆 priority_queue<int, vector<int>, greater<int> > pq3(num, num + 6); //小顶堆 cout << "pq1 is empty? " << (pq1.empty() ? "yes" : "no") << endl; cout << "the size of pq2 is "...
x > b.x; } }; int main() { priority_queue<node,vector<node>,cmp> pq; //带有三个参数的优先队列; for(int i = 1; i <= 5; i++) for(int j = 1; j <= 5; j++) pq.push(node(i,j)); while(!pq.empty()) { cout<<pq.top().x<<" "<<pq.top().y<<endl; pq.pop(...
}intmain(){//创建一个 priority_queue 容器适配器,其使用默认的 vector 基础容器以及 less 排序规则。priority_queue<node> pq; pq.push(node(1,2)); pq.push(node(2,2)); pq.push(node(3,4)); pq.push(node(3,3)); pq.push(node(2,3)); ...
struct cmp{ bool operator () (const node & a, const node & b) const { return a.price < b.price; } }; priority_queue <node,vector<node>,cmp > q; 1 2 3 4 5 6自定义函数的小技巧1、形参表里面的后一个优先级高于前一个,重载的是“<”,默认的后一个小于前一个; 2、特别注意三种...
priority_queue<node, vector<node>, cmp> p; ---其实这两种方法,很常见。使用STL的algorithm里的sort等算法时,都需要指定! 2. 对于优先队列使用时,特别是多个case的时候,要注意初始的清空! while ( !q.empty() ) q.pop(); //效率不高?为什么没有提供clear的功能噢。 q.push( cur...
; // priority_queue<node, vector<node>, less<node>> test; priority_queue<P, vector<P>, cmp1> test; test.push({ 3, 2 }); test.push({ 1, 6 }); test.push({ 2, 8 }); test.push({ 5, 10 }); while (!test.empty()) { std::cout << ' ' << test.top().second; //...
bool cmp(int a, int b) { return a > b; // 实现小顶堆 } priority_queue<int, vector<int>, decltype(&cmp)> pq(cmp); 使用仿函数: 仿函数是一个重载了()运算符的类,它可以像函数一样被调用。你可以定义一个仿函数,并将其作为比较器传递给priority_queue。 cpp struct ...