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Cod sursa(job #50962)
#include <stdio.h>
#include <stdlib.h>
#include <iostream.h>
long long S, sum;
int N;
int semn[50001];
int A[50001];
int main()
{
freopen("semne.in", "rt", stdin);
freopen("semne.out", "wt", stdout);
// FILE *fin = fopen("semne.in", "rt");
// FILE *fout = fopen("semne.out", "wt");
int i = 0, v;
double r;
srand( time(0) );
scanf("%d %lld", &N, &S);
for (i = 1; i <= N; i++)
{
scanf("%d", &A[i]);
//if (v == 0) sum += A[i];
//else sum -= A[i], semn[i] = 1;
sum += A[i];
semn[i-1] = 1;
//r = ( (double)rand() / ((double)(RAND_MAX)+(double)(1)) );
//printf("%d", (int)(r * (double)N) + 1);
}
// fclose(fin);
while (S != sum)
{
if (S < sum)
{
r = ( (double)rand() / ((double)(RAND_MAX)+(double)(1)) );
v = (int)(r * (double)N) + 1;
while (semn[v-1] == -1)
{
r = ( (double)rand() / ((double)(RAND_MAX)+(double)(1)) );
v = (int)(r * (double)N) + 1;
}
semn[v-1] = -1;
sum -= 2*A[v];
}
if (S > sum)
{
r = ( (double)rand() / ((double)(RAND_MAX)+(double)(1)) );
v = (int)(r * (double)N) + 1;
while (semn[v-1] == 1)
{
r = ( (double)rand() / ((double)(RAND_MAX)+(double)(1)) );
v = (int)(r * (double)N) + 1;
}
semn[v-1] = 1;
sum += 2*A[v];
}
}
for (i = 0; i < N; i++)
if (semn[i] == 1) printf("+");
else printf("-");
// printf("%s", semn);
// fclose(fout);
return 0;
}