poj1700 Crossing River

<span style="font-size:18px;">#include <iostream>
#include <cstdio>
#include <cstring>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <vector>
#include <cmath>
#include <algorithm>
using namespace std;
const double eps = 1e-6;
const double pi = acos(-1.0);
const int INF = 0x3f3f3f3f;
const int MOD = 1000000007;
#define ll long long
#define CL(a,b) memset(a,b,sizeof(a))
#define MAXN 100010

int T,n;
int a[1010];
int sum;

int main()
{
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&n);
        CL(a, 0);
        for(int i=0; i<n; i++)
            scanf("%d",&a[i]);
        if(n == 1){printf("%d\n",a[0]); continue;}
        sort(a, a+n);
        int m1 = a[0], m2 = a[1];
        sum = 0;
        for(int i=n-1; i>1; i-=2)
        {
            if(m2*2<m1+a[i-1])
            {
                if(i == 2) sum = sum+m1+m2+a[i];
                else sum = sum+m1+m2*2+a[i];
            }
            else
            {
                sum = sum+m1*2+a[i]+a[i-1];
                if(i == 2) sum -= a[0];
            }
        }
        if(n!=0&&n%2==0) sum += m2;
        printf("%d\n",sum);
    }
    return 0;
}
</span>