hdu1280（哈希入门）

#include
#include
#include
#include
#include
#include
#include
#include
#define mem(a,x) memset(a,x,sizeof(a))
#define s1(x) scanf("%d",&x)
#define s2(x,y) scanf("%d%d",&x,&y)
#define s3(x,y,z) scanf("%d%d%d",&x,&y,&z)
#define s4(x,y,z,k) scanf("%d%d%d%d",&x,&y,&z,&k)
#define ff(a,n) for(int i = 0 ; i < n; i++) scanf("%d",a+i)
#define tp(x) printf("x = %d\n",x)
#define ansp(x) printf("%d\n",x)
#define ls 2*rt
#define rs 2*rt+1
#define lson ls,L,mid
#define rson rs,mid+1,R
#define ll long long
using namespace std;
typedef pair pii;
const ll inf = 0x3f3f3f3f;

const int mx = 3e3+10;
int n,m;
int a[mx],ha[10001];
 
int main(){
	
	while(s2(n,m) != EOF){
	
		for(int i = 0; i < n; i++)
			scanf("%d",a+i);
		
		for(int i = 0; i < n; i++)
			for(int j = i+1; j < n; j++){
				ha[a[i]+a[j]]++;
			}
		
	
		int k = m;
		
		for(int i=10000; i >= 0 && k; ){
			if(!ha[i]){
				i--;
				continue;
			}
			if(k == m){
				printf("%d",i);
			}		
			else
				printf(" %d",i);
			k--;
			ha[i]--;
		}
		puts("");
	}
	return 0;
}