/BINAS - Liệt kê chuỗi nhị phân

              #include <iostream>
        using namespace std;
        
        void output(int* arr, int n) {
          for (int i = 0; i < n; i++) {
            cout << arr[i];
          }
          cout << endl;
        }
        
        bool nextBinaryString(int* arr, int n) {
          int i = n - 1;
          while (i >= 0 && arr[i] != 0) {
            arr[i] = 0;
            i--;
          }
          if (i >= 0) {
            arr[i] = 1;
            return false;
          }
          else {
            return true;
          }
        }
        
        void generate(int* arr, int n) {
          bool isFinal = false;
          while (!isFinal) {
            output(arr, n);
            isFinal = nextBinaryString(arr, n);
          }
        }
        
        int main() {
          int n;
          //cout << "Nhap n: ";
          cin >> n;
          int* arr = new int[n]();
          generate(arr, n);
        
          return 0;
        }