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Cod sursa(job #965564)
#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;
}