bai_2.cpp

#include <bits/stdc++.h>
using namespace std;

int main() {
  int n, b[50];
  cout << "Nhap n: "; cin >> n;
  for (int i = 0; i < n; i++) {
    cout << "Nhap b[" << i << "] = ";
    cin >> b[i];
  }
  int neg = 0, pos = 0;
  for (int i = 0; i < n; i++) {
    if (b[i] < 0) neg++;
    if (b[i] > 0) pos++;
  }
  cout << "So luong so am: " << neg << '\n';
  cout << "So luong so duong: " << pos << '\n';
  cout << "So luong so khong: " << n - neg - pos << '\n';
  return 0;
}