#include<iostream> #include<set> #include<vector> #include<queue> using namespace std; typedef long long LL; int coeff[3] = {2,3,5}; int main(){ priority_queue<LL,vector<LL>,greater<LL> >pq; set<LL>s; pq.push(1); s.insert(1); for(int i=1;;i++){ LL x = pq.top();pq.pop(); if(i==1500){ cout<<x<<endl; break; } for(int j=0;j<3;j++){ LL x2 = x*coeff[j]; if(!s.count(x2)){ s.insert(x2); pq.push(x2); } } } return 0; }
greater反义:less