http://poj.org/problem?id=2573 //* @author: 82638882@163.com import java.util.*; public class Main { public static void main(String[] args) { Scanner in=new Scanner(System.in); int a=in.nextInt(); ArrayList< Integer> t=new ArrayList< Integer>(); for(int i=0;i< a;i++) t.add(in.nextInt()); if(a==1){ System.out.println(t.get(0)); System.out.println(t.get(0)); } else{ int total=0; Collections.sort(t); ArrayList< Integer> t2=new ArrayList< Integer>(); ArrayList< Integer> t3=new ArrayList< Integer>(); int m1=t.get(0); int m2=t.get(1); int w=a; while(w>3) { total+=t.get(w-1)+m1+Math.min(m2*2,m1+t.get(w-2)); if(m2*2>(m1+t.get(w-2))) { t2.add(m1); t2.add(t.get(w-2)); t3.add(m1); t2.add(m1); t2.add(t.get(w-1)); t3.add(m1); } else { t2.add(m1); t2.add(m2); t3.add(m1); t2.add(t.get(w-2)); t2.add(t.get(w-1)); t3.add(m2); } w-=2; } if(w==2){ total+=m2; t2.add(m1); t2.add(m2); } else { total+=m1+m2+t.get(2); t2.add(m1); t2.add(m2); t3.add(m1); t2.add(m1); t2.add(t.get(2)); } System.out.println(total); for(int i=0;i< a-2;i++) { System.out.println(t2.get(i*2)+" "+t2.get(i*2+1)); System.out.println(t3.get(i)); } System.out.println(t2.get(a*2-4)+" "+t2.get(a*2-3)); } } }
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