Submission #1117651

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117651		vjudge1	괄호 문자열 (CEOI16_match)	C++17	10 / 100	1 ms	336 KiB

match

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define inf 0x3F3F3F3F3F3F3F3F

const int MXN = 3e6 + 5;
const int mod = 998244353;

int n;
string s, res;
vector<int> st;
int fl[26], fcur[26];

void fix(int ind)
{
  fcur[s[ind] - 'a'] -= 2;
  res[ind] = ')';
  while (!st.empty() && s[st.back()] != s[ind])
  {
    int nw = st.back();
    st.pop_back();
    fix(nw);
  }
  if (st.empty())
  {
    cout << -1 << '\n';
    exit(0);
  }
  st.pop_back();
}

void _()
{
  cin >> s;
  n = s.length();
  if (n & 1) 
  {
    cout << -1 << '\n';
    return;
  }
  for (char &ch : s) fl[ch - 'a']++;
  res = s;
  for (int i = 0; i < n; i++)
  {
    fcur[s[i] - 'a']++, fl[s[i] - 'a']--;
    if (fl[s[i] - 'a'] < fcur[s[i] - 'a']) fix(i);
    else res[i] = '(', st.push_back(i);
  }
  cout << res << '\n';
}

signed main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int t = 1;
  // cin >> t;
  while (t--) _();
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 27
• Subtask 3: 0 / 63