task_1.cpp

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

int main() {
  int a[100], n;
  cout << "Nhap n: "; cin >> n;
  for (int i = 0; i < n; i++) {
    cout << "Nhap a[" << i << "]: ";
    cin >> a[i];
  }
  // task_a
  int am = 0, duong = 0;
  for (int i = 0; i < n; i++) {
    if (a[i] < 0) am++;
    if (a[i] > 0) duong++;
  }
  cout << "So so am: " << am << endl;
  cout << "So so duong: " << duong << endl;
  // task_b
  int chan = 0, le = 0;
  for (int i = 0; i < n; i++) {
    if (a[i] % 2 == 0) chan += a[i];
    else le += a[i];
  }
  cout << "Tong so chan: " << chan << endl;
  cout << "Tong so le: " << le << endl;
}