Submission #3426739

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define FOR(I,X,Y) for(long long (I)=(X);(I)<(Y);(I)++)
#define REP(I,X,Y) for(long long (I)=(Y)-1;(I)>=(X);(I)--)
#define ALL(X) (X).begin(),(X).end()
#define pb push_back
#define COUNT(V,X) upper_bound((V).begin(),(V).end(),X)-lower_bound((V).begin(),(V).end(),X)
#define debug(x) cerr<<#x<<':'<<x<<endl;
#define DEBUG(v) cerr<<#v<<':';for(auto x:v)cerr<<x<<' ';cerr<<endl;
#define INF 1000000007
#define LINF 1000000000000000007
#define EPS 1e-9
typedef long long ll;

signed main(){
 int N;
 cin >> N;
 vector<ll> A(N);
 FOR(i,0,N)cin >> A[i];
 sort(ALL(A),greater<ll>());
 ll ans = 0;
 FOR(i,0,(N+1)/2)ans += A[i*2];
 cout << ans << endl;
}

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