Submission #807047

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Source Code Expand

#include <iostream>
#include <vector>
#include <algorithm>
#include <cstdio>
#include <utility>
#include <string>
#include <sstream>
#include <fstream>
#include <cmath>
#include <stack>
#include <queue>
#include <list>
#include <map>

using namespace std;

typedef vector<int> VI;
typedef vector<VI> VVI;

#define MAX(x,y) ( (x) > (y) ? (x) : (y) )
#define MIN(x, y) ( (x) < (y) ? (x) : (y) )
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n)  FOR(i,0,n)
#define IVFOR(p,a) for(vector<int>::iterator p = (a).begin(); p!=(a).end(); p++)
#define ILFOR(p,a) for(list<int>::iterator p = (a).begin(); p!=(a).end(); p++)
#define ALL(a)  (a).begin(),(a).end()
#define SORT(c) sort((c).begin(),(c).end())
#define CHECK(x)  cout << #x << " = " << (x) << endl
#define FINA(y) cout << (y) << endl

int main(){

  int n;
 
  cin >> n;
  VI l(2*n);
  
  REP(i,2*n){
    cin >> l[i];
  }

  SORT(l);

  VI ll(l.rbegin(), l.rend());

  int ans = 0;

  for(int i = 0; i<2*n; i = i+2){
    ans += l[i];
  }

  FINA(ans);

 return 0;
}

Submission Info

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