Cod sursa(job #965564)

Utilizator dragangabrielDragan Andrei Gabriel dragangabriel Data 24 iunie 2013 10:40:02
Problema Semne Scor 0
Compilator cpp Status done
Runda Lista lui wefgef Marime 0.91 kb
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<algorithm>
using namespace std;
int n,i,j,k,x,y,v[50001],plus[50001],minus[50001],random;
char semn[50001];
long long sum,s;

int main()
{
	freopen("semne.in","r",stdin);
	freopen("semne.out","w",stdout);
	srand(time(0));
	scanf("%d",&n);
	scanf("%lld",&s);
	for (i=1;i<=n;i++)
	{
		scanf("%d",&v[i]);
		if (sum<s) plus[++x]=i,sum=sum+v[i],semn[i]='+';else
			minus[++y]=i,sum=sum-v[i],semn[i]='-';
	}
	while (sum!=s)
	{
		if (sum<s)
		{
			random=rand()%y+1;
			sum=sum+2*v[minus[random]];
			semn[minus[random]]='+';
			swap(minus[random],minus[y]);
			plus[++x]=minus[y];
			minus[y]=0;
		}else
		{
			random=rand()%x+1;
			sum=sum-2*v[plus[random]];
			semn[plus[random]]='-';
			swap(plus[random],plus[x]);
			minus[++y]=plus[x];
			plus[x]=0;
		}
	}
	for (i=1;i<=n;i++) printf("%c",semn[i]);
	return 0;
}