Regular Bracket Sequence

#include <bits/stdc++.h>
#define ll long long

using namespace std;

int main () {
    int n, l, r;
    cin>>n>>l>>r;
    if (((r - l) & 1) && n % 2 == 0) {
        if (l & 1) {
            for (int x = 1; x <= n; x++) {
                if (x & 1) {
                    if (x <= r && x >= l) cout<<"[";
                    else cout<<"(";
                } else {
                    if (x <= r && x >= l) cout<<"]";
                    else cout<<")";
                }
            }
        } else {
            cout<<"(";
            for (int x = 2; x < n; x++) {
                if (~x & 1) {
                    if (x <= r && x >= l) cout<<"[";
                    else cout<<"(";
                } else {
                    if (x <= r && x >= l) cout<<"]";
                    else cout<<")";
                }
            }
            cout<<")";
        }
        cout<<endl;
    } else {
        cout<<"QAQ"<<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