Regular Bracket Sequence

#include <iostream>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n, l, r;
  cin >> n >> l >> r;
  if ((r-l+1) % 2 == 1 || (l-1)%2 != (n-r)%2) cout << "QAQ\n";
  else {
    for (int i = 1; i+1 < l; i += 2) cout << "()";
    if ((l-1)%2 == 1) cout << "(";
    for (int i = l; i <= r; i += 2) cout << "[]";
    if ((n-r)%2 == 1) cout << ")";
    for (int i = r+1; i < n; i += 2) cout << "()";
    cout << endl;
  }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: ACCEPTED