Submission #3433864

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Source Code Expand

#include<iostream>
#include<vector>
#include<algorithm>
#include<cctype>
#include<utility>
#include<string>
#include<cmath>
#include <numeric>
 
 
#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define FORR(i, m, n) for(int i = m;i >= n;i--)
#define SORT(v, n) sort(v, v+n);
#define VSORT(v) sort(v.begin(), v.end());
#define llong long long
#define pb(a) push_back(a)
#define INF 999999999
using namespace std;
typedef pair<int, int> P;
typedef pair<llong, llong> LP;
typedef pair<int, P> PP;
typedef pair<llong, LP> LPP;
 
typedef long long int ll;
#define ARRAY_MAX 100005


int main(){

    int n;
    cin >> n;
    vector<int> a(2*n);
    REP(i,2*n){
        cin >> a[i];
    }
    

    VSORT(a);
    int ans = 0;
    for(int i = 0;i < 2*n;i+=2){
        ans += min(a[i],a[i+1]);
    }
    cout << ans << endl;


    return 0;
}

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