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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
  5.  
  6. int Rand(int l, int h){
  7.     return uniform_int_distribution<int>(l, h)(rng);
  8. }
  9. int main(){
  10.     int n = Rand(1, 100); // length of the regular bracket is 2 * n
  11.     stack<char> st;
  12.     int pref = 0;
  13.     for (int i = 1; i <= n; ++i){
  14.         int x = Rand(0, 1);
  15.         if (x == 1){
  16.             pref ++;
  17.             st.push('(');
  18.             cout << '(';
  19.         }
  20.         else{
  21.             if (pref > 0) {
  22.                 pref--; st.push(')');
  23.                 cout << ')';
  24.             }
  25.             else{
  26.                 pref++; st.push('(');
  27.                 cout << '(';
  28.             }
  29.         }
  30.     }
  31.     while(st.size()){
  32.         char c = st.top(); st.pop();
  33.         cout << (c == '(' ? ')' : '(');
  34.     }
  35. }
Success #stdin #stdout 0.01s 5276KB
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stdout 
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https://ideone.com/cLbvx9
language:
C++14 (gcc 8.3)
created:
158 days ago
visibility:
secret

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