比赛 20160420s 评测结果 AAAAAAAAAA
题目名称 买汽水 最终得分 100
用户昵称 咸鱼二号 运行时间 0.006 s
代码语言 C++ 内存使用 0.31 MiB
提交时间 2016-04-20 09:53:45
显示代码纯文本
#include<iostream>
#include<cstring>
#include<cstdio>
#include<string>
#include<algorithm>
#include<cmath>
#include<utility>
#include<cstdlib>
#include<iomanip>	//cout<<setiosflags(ios::fixed)<<setprecision(2);
#include<ctime> //double a=(double)clock();	cout<<a<<endl;
#include<vector>
#include<queue>
using namespace std;
inline int read(){
	int x=0,ff=1;char ch=getchar();
	while(ch>'9'||ch<'0'){if(ch=='-')ff=-1; ch=getchar();}
	while(ch<='9'&&ch>='0'){x=x*10+ch-'0';ch=getchar();}
	return ff*x;
}
inline int mymin(int xx,int yy)
{if(xx>yy)return yy;return xx;}
inline int mymax(int xx,int yy)
{if(xx<yy)return yy;return xx;}
inline bool mycmp(const int &xx,const int &yy)
{return xx>yy;}
int N,M,a[41],ans=0;
long long sum[41];
void dfs(int depth,int v){
	if(clock()>950){
		printf("%d\n",ans);
		exit(0);
	}
	if(ans==M){
		printf("%d\n",ans);
		exit(0);
	}
	if(depth==N+1){
		if(v>ans)
			ans=v;
		return;
	}
	if(v+sum[N]-sum[depth-1]<=ans)
		return;
	if(v+a[depth]<=M)
		dfs(depth+1,v+a[depth]);
	dfs(depth+1,v);
}
int main(){
	freopen("drink.in","r",stdin);
	freopen("drink.out","w",stdout);
	N=read(),M=read();
	for(int i=1;i<=N;i++)
		a[i]=read(),sum[i]=a[i]+sum[i-1];
	sort(a+1,a+1+N,mycmp);
	for(int i=1;i<=N;i++)
		if(ans+a[i]<=M)
			ans+=a[i];
	if(ans==sum[N]){
		printf("%d\n",ans);
		return 0;
	}
	dfs(1,0);
	printf("%d\n",ans);
	return 0;
}