제출 #223070

#제출 시각아이디문제언어결과실행 시간메모리
223070Minnakhmetov괄호 문자열 (CEOI16_match)C++14
100 / 100
20 ms11904 KiB
#include <bits/stdc++.h> using namespace std; #define ll long long #define all(aaa) aaa.begin(), aaa.end() const int N = 1e5 + 5, A = 26; int dp[N][A]; string ans, s; void solve(int l, int r) { if (l > r) return; int x = dp[r][s[l] - 'a'] - 1; ans[l] = '('; ans[x] = ')'; solve(l + 1, x - 1); solve(x + 1, r); } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cin >> s; vector<char> stk; for (char c : s) { if (stk.empty() || stk.back() != c) { stk.push_back(c); } else { stk.pop_back(); } } if (!stk.empty()) { cout << "-1\n"; return 0; } int n = s.size(); memset(dp, -1, sizeof(dp)); for (int i = 0; i < n; i++) { dp[i][s[i] - 'a'] = i + 1; if (i > 0 && dp[i - 1][s[i] - 'a'] > 1) { for (int j = 0; j < A; j++) { dp[i][j] = max(dp[i][j], dp[dp[i - 1][s[i] - 'a'] - 2][j]); } } } // for (int i = 0; i < n; i++) { // for (int j = 0; j < 2; j++) { // cout << dp[i][j] << " "; // } // cout << "\n"; // } // cout << dp[4][1] << "\n"; // return 0; ans.resize(n); solve(0, n - 1); cout << ans << "\n"; return 0; }
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