只需要自定义比较函数即可！
#include<bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
class mycomparison
{
public:
bool operator () (const pii &n1, const pii &n2) const
{
if(n1.first == n2.first)
return n1.second > n2.second;
return n1.first > n2.first;
}
};
int main()
{
priority_queue<pii, vector<pii>, mycomparison> q;
q.push(pii(3, 4));
q.push(pii(5, 6));
q.push(pii(5, 4));
while(!q.empty())
{
cout << q.top().first << " " << q.top().second << endl;
q.pop();
}
return 0;
}