filter

#include <stdio.h>
#include <stdbool.h>
#define NMAX 100

void delete(int arr[], int *n, int pos) {
  for (int i = pos; i < *n - 1; i++) {
    arr[i] = arr[i + 1];
  }
  (*n)--;
}

void filter(int arr[], int *n, bool (*cond)(int)) {
  for (int i = 0; i < *n; i++) {
    if (!cond(arr[i])) {
      delete(arr, n, i--);
    }
  }
}

bool cond(int x) {
  return x < 0;
}

int main(void) {
  int n;
  scanf("%d", &n);
  static int arr[NMAX];
  for (int i = 0; i < n; i++) {
    scanf("%d", arr + i);
  }

  filter(arr, &n, cond);

  for (int i = 0; i < n; i++) {
    printf("%d ", arr[i]);
  }
  puts("");
  return 0;
}