delete pics to save space

2.136.cpp

@@ -0,0 +1,33 @@
+#include<iostream>
+#include<vector>
+#include<queue>
+#include<set>
+using namespace std;
+typedef long long LL;
+const int coeff[3]={2,3,5};
+int main()
+{
+	priority_queue<LL,vector<LL>,greater<LL> > q;
+	set<LL> s;
+	q.push(1);
+	s.insert(1);
+	for(int i=1;;i++)
+	{
+		LL x=q.top();q.pop();
+		if(i==1500)
+		{
+			cout<<"The 1500'th ugly number is "<<x<<"."<<endl;
+			return 0;
+		}
+		for(int j=0;j<3;j++)
+		{
+			LL x2=x*coeff[j];
+			if(!s.count(x2))
+			{
+				s.insert(x2);
+				q.push(x2);
+			}
+		}
+	}
+	return 0;
+}