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Cod sursa(job #82864)
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <algorithm>
#define maxn 50000
#define fout out
FILE *in = fopen("semne.in","r"), *out = fopen("semne.out","w");
int a[maxn];
char semn[maxn];
int n;
long long s;
long long sol = 0;
void read()
{
fscanf(in, "%d %lld", &n, &s);
for ( int i = 0; i < n; ++i )
{
fscanf(in, "%d", &a[i]);
// if ( sol < s )
// {
int t = rand() & 1;
if ( t == 1 )
{
sol += a[i];
semn[i] = 1;
}
else
{
sol -= a[i];
semn[i] = -1;
}
// }
// else
// {
// sol -= a[i];
// semn[i] = -1;
// }
}
//std::sort(a, a+n);
}
int main()
{
srand(time(0));
read();
while ( sol != s )
{
int q = rand();
if ( q >= n )
q %= n;
if ( sol < s && semn[q] == -1 )
sol += (a[q]<<1) * (semn[q] = 1);
else if ( sol > s && semn[q] == 1 )
sol += (a[q]<<1) * (semn[q] = -1);
}
for ( int i = 0; i < n; ++i )
if ( semn[i] == -1 )
fprintf(fout, "-");
else
fprintf(fout, "+");
return 0;
}