1
1 a
2
2 ab
3
3 abc

1
int main() {
2
    ifstream in("test.txt");
3
    while (!in.eof()) {
4
         int length;
5
        in >> length;
6
        char tmp[length + 1];
7
        in.read(tmp, length);
8
        cout << tmp << endl;
9
    }
10
}