Submission #116856

#	Time	Username	Problem	Language	Result	Execution time	Memory
116856		minhtung0404	Match (CEOI16_match)	C++17	100 / 100	20 ms	12288 KiB

match

//https://oj.uz/problem/view/CEOI16_match

#include<bits/stdc++.h>
const int N = 1e5 + 5;
using namespace std;

string s, x;
int n, nxt[N][26], f[N];

void solve(int l, int r){
    if (l > r) return;
    int mat = nxt[r][s[l] - 'a'];
    x[l] = '('; x[mat] = ')';
    solve(l+1, mat-1); solve(mat+1, r);
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    cin >> s;
    n = s.size();
    for (int i = 0; i < n; i++){
        if (i == 0) f[i] = -1;
        else f[i] = nxt[i-1][s[i] - 'a'];
        for (int j = 0; j < 26; j++){
            if (s[i] - 'a' == j) nxt[i][j] = i;
            else{
                if (f[i] > 0) nxt[i][j] = nxt[f[i]-1][j];
                else nxt[i][j] = -1;
            }
        }
    }
    stack <int> ms;
    for (int i = 0; i < n; i++){
        if (ms.size() && ms.top() == s[i] - 'a') ms.pop();
        else ms.push(s[i] - 'a');
    }
    if (ms.size()) return cout << -1, 0;
    x = s;
    solve(0, n-1);
    cout << x;
}

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