31 lines
588 B
C++
31 lines
588 B
C++
#include<iostream>
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#include<map>
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#define ll long long
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#define maxn 100+5
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using namespace std;
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ll a[maxn];
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map<int,int>mapp;
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int main()
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{
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int n;
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while(cin>>n)
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{
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mapp.clear();
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ll sum=0;
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for(int i=0;i<n;i++)
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{
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cin>>a[i];
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for(int j=0;j<i;j++)
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{
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if(mapp.find(a[i]+a[j])==mapp.end())
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{
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sum+=(a[i]+a[j]);
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mapp[a[i]+a[j]]=1;
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}
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}
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}
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cout<<sum<<endl;
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}
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return 0;
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}
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