제출 #1117650

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1117650		HasanV11010238	괄호 문자열 (CEOI16_match)	C++17	0 / 100	1 ms	336 KiB

match

#include <bits/stdc++.h>
using namespace std;
#define ll long long
mt19937_64 rnd(time(0));
vector<vector<ll>> ve;
vector<ll> ha, pr;
vector<char> ans;
void rec(int l, int r, int ind){
    if (l > r){
        return;
    }
    ll nl = l, nr = r;
    while ((pr[ve[ind][nr]] ^ pr[ve[ind][nl] - 1]) != 0){
        nr -= 2;
    }
    ans[ve[ind][nr]] = ')';
    ans[ve[ind][nl]] = '(';
    rec(nr + 1, r, ind);
    rec(nl + 1, nr - 1, ind);
}
int main(){
    string s;
    cin>>s;
    int n = s.size();
    s = " " + s;
    ve.resize(26), ha.assign(26, 0), pr.assign(n + 1, 0), ans.assign(n + 1, -1);
    for (int i = 0; i < 26; i++){
        ha[i] = rnd();
    }
    for (int i = 1; i <= n; i++){
        pr[i] = pr[i - 1] ^ ha[s[i] - 'a'];
        ve[s[i] - 'a'].push_back(i);
    }
    deque<int> de;
    for (int i = 1; i <= n; i++){
        int ch = s[i] - 'a';
        if (de.size() == 0 || de.back() != ch){
            de.push_back(ch);
        }
        else{
            de.pop_back();
        }
    }
    if (de.size() != 0){
        cout<<-1;
    }
    else{
        for (int i = 0; i < 26; i++){
            rec(0, ve[i].size() - 1, i);
        }
        for (int i = 1; i <= n; i++){
            cout<<ans[i];
        }
    }
}

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