OJ-Problems-Source/HDOJ/1303_autoAC.cpp

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2016-08-13 23:51:27 +08:00
#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
int temp;
while(cin>>temp&&temp!=-1)
{
vector<int> v;
v.push_back(temp);
while(cin>>temp&&temp!=0)
v.push_back(temp);
int sum=0;
for(int i=0;i!=v.size();++i)
{
auto b=find(v.cbegin(),v.cend(),2*v[i]);
if(b!=v.cend())
sum++;
}
cout<<sum<<endl;
}
return 0;
}