perceptron.c

#define classify(x) (((x) >= 0.5) ? '+' : '-')

float sigmoid(float x) {
  return 1 / (1 + exp((double) -x));
}

main() {
  int d, q, i, a, t;
  scanf("%d %d\n", &d, &q);
  int beta[d+1];

  for (i=0; i<d; i++)
    scanf("%d ", &beta[i]);

  scanf("%d\n", &beta[i]);

  while (q--) {
    a = beta[0];
    for (i=1; d>i; i++) {
      scanf("%d ", &t);
      a += beta[i] * t;
    }
    scanf("%d\n", &t);
    a += beta[i] * t;
    putchar(classify(sigmoid(a)));
  }

  return 0;
}