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Cod sursa(job #965573)
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<algorithm>
using namespace std;
int n,i,j,k,x,y,v[50001],st[50001],dr[50001],R;
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) st[++x]=i,sum=sum+v[i],semn[i]='+';else
dr[++y]=i,sum=sum-v[i],semn[i]='-';
}
while (sum!=s)
{
if (sum<s)
{
R=rand()%y+1;
sum=sum+2*v[dr[R]];
semn[dr[R]]='+';
swap(dr[R],dr[y]);
st[++x]=dr[y];
dr[y--]=0;
}else
{
R=rand()%x+1;
sum=sum-2*v[st[R]];
semn[st[R]]='-';
swap(st[R],st[x]);
dr[++y]=st[x];
st[x--]=0;
}
}
for (i=1;i<=n;i++) printf("%c",semn[i]);
return 0;
}